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Finding the Fourth Proportional to 1,239.63, 1,710.90 and 715.83

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Solution

The fourth proportional to 1,239.63, 1,710.90 and 715.83 is: 987.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.63 : 1,710.90 = 715.83 : x
  2. Step 2: Convert to fraction form
    1,239.63/1,710.90 = 715.83/x
  3. Step 3: Cross multiply
    1,239.63x = 1,710.90 × 715.83
  4. Step 4: Simplify right side
    1,239.63x = 1,224,713.55
  5. Step 5: Solve for x
    x = 1,224,713.55/1,239.63
  6. Step 6: Final answer
    x = 987.97

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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.