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Finding the Fourth Proportional to 1,115.65, 1,539.15 and 717.24

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Solution

The fourth proportional to 1,115.65, 1,539.15 and 717.24 is: 989.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.65 : 1,539.15 = 717.24 : x
  2. Step 2: Convert to fraction form
    1,115.65/1,539.15 = 717.24/x
  3. Step 3: Cross multiply
    1,115.65x = 1,539.15 × 717.24
  4. Step 4: Simplify right side
    1,115.65x = 1,103,948.41
  5. Step 5: Solve for x
    x = 1,103,948.41/1,115.65
  6. Step 6: Final answer
    x = 989.51

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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.