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Finding the Fourth Proportional to 1,239.13, 1,710.08 and 715.20

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Solution

The fourth proportional to 1,239.13, 1,710.08 and 715.20 is: 987.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.13 : 1,710.08 = 715.20 : x
  2. Step 2: Convert to fraction form
    1,239.13/1,710.08 = 715.20/x
  3. Step 3: Cross multiply
    1,239.13x = 1,710.08 × 715.20
  4. Step 4: Simplify right side
    1,239.13x = 1,223,049.22
  5. Step 5: Solve for x
    x = 1,223,049.22/1,239.13
  6. Step 6: Final answer
    x = 987.02

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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.