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Finding the Fourth Proportional to 1,107.52, 1,529.40 and 715.21

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Solution

The fourth proportional to 1,107.52, 1,529.40 and 715.21 is: 987.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.52 : 1,529.40 = 715.21 : x
  2. Step 2: Convert to fraction form
    1,107.52/1,529.40 = 715.21/x
  3. Step 3: Cross multiply
    1,107.52x = 1,529.40 × 715.21
  4. Step 4: Simplify right side
    1,107.52x = 1,093,842.17
  5. Step 5: Solve for x
    x = 1,093,842.17/1,107.52
  6. Step 6: Final answer
    x = 987.65

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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.