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Finding the Fourth Proportional to 1,118.75, 1,543.94 and 646.73

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Solution

The fourth proportional to 1,118.75, 1,543.94 and 646.73 is: 892.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.75 : 1,543.94 = 646.73 : x
  2. Step 2: Convert to fraction form
    1,118.75/1,543.94 = 646.73/x
  3. Step 3: Cross multiply
    1,118.75x = 1,543.94 × 646.73
  4. Step 4: Simplify right side
    1,118.75x = 998,512.32
  5. Step 5: Solve for x
    x = 998,512.32/1,118.75
  6. Step 6: Final answer
    x = 892.52

Related Problems

Find fourth proportional to 559.38, 771.97 and 323.37
Half scale
Find fourth proportional to 2,237.50, 3,087.88 and 1,293.46
Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.