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Finding the Fourth Proportional to 1,118.76, 1,543.80 and 621.36

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Solution

The fourth proportional to 1,118.76, 1,543.80 and 621.36 is: 857.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.76 : 1,543.80 = 621.36 : x
  2. Step 2: Convert to fraction form
    1,118.76/1,543.80 = 621.36/x
  3. Step 3: Cross multiply
    1,118.76x = 1,543.80 × 621.36
  4. Step 4: Simplify right side
    1,118.76x = 959,255.57
  5. Step 5: Solve for x
    x = 959,255.57/1,118.76
  6. Step 6: Final answer
    x = 857.43

Related Problems

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Half scale
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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.