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Finding the Fourth Proportional to 1,118.56, 1,543.70 and 646.54

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Solution

The fourth proportional to 1,118.56, 1,543.70 and 646.54 is: 892.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.56 : 1,543.70 = 646.54 : x
  2. Step 2: Convert to fraction form
    1,118.56/1,543.70 = 646.54/x
  3. Step 3: Cross multiply
    1,118.56x = 1,543.70 × 646.54
  4. Step 4: Simplify right side
    1,118.56x = 998,063.80
  5. Step 5: Solve for x
    x = 998,063.80/1,118.56
  6. Step 6: Final answer
    x = 892.28

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Double scale
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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.