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Finding the Fourth Proportional to 721.48, 1,080.54 and 477.64

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Solution

The fourth proportional to 721.48, 1,080.54 and 477.64 is: 715.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.48 : 1,080.54 = 477.64 : x
  2. Step 2: Convert to fraction form
    721.48/1,080.54 = 477.64/x
  3. Step 3: Cross multiply
    721.48x = 1,080.54 × 477.64
  4. Step 4: Simplify right side
    721.48x = 516,109.13
  5. Step 5: Solve for x
    x = 516,109.13/721.48
  6. Step 6: Final answer
    x = 715.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.