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Finding the Fourth Proportional to 721.71, 1,078.31 and 715.23

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Solution

The fourth proportional to 721.71, 1,078.31 and 715.23 is: 1,068.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.71 : 1,078.31 = 715.23 : x
  2. Step 2: Convert to fraction form
    721.71/1,078.31 = 715.23/x
  3. Step 3: Cross multiply
    721.71x = 1,078.31 × 715.23
  4. Step 4: Simplify right side
    721.71x = 771,241.45
  5. Step 5: Solve for x
    x = 771,241.45/721.71
  6. Step 6: Final answer
    x = 1,068.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.