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Finding the Fourth Proportional to 1,239.26, 1,710.18 and 715.29

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Solution

The fourth proportional to 1,239.26, 1,710.18 and 715.29 is: 987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.26 : 1,710.18 = 715.29 : x
  2. Step 2: Convert to fraction form
    1,239.26/1,710.18 = 715.29/x
  3. Step 3: Cross multiply
    1,239.26x = 1,710.18 × 715.29
  4. Step 4: Simplify right side
    1,239.26x = 1,223,270.03
  5. Step 5: Solve for x
    x = 1,223,270.03/1,239.26
  6. Step 6: Final answer
    x = 987.10

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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.