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Finding the Fourth Proportional to 1,239.86, 1,710.90 and 715.92

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Solution

The fourth proportional to 1,239.86, 1,710.90 and 715.92 is: 987.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.86 : 1,710.90 = 715.92 : x
  2. Step 2: Convert to fraction form
    1,239.86/1,710.90 = 715.92/x
  3. Step 3: Cross multiply
    1,239.86x = 1,710.90 × 715.92
  4. Step 4: Simplify right side
    1,239.86x = 1,224,867.53
  5. Step 5: Solve for x
    x = 1,224,867.53/1,239.86
  6. Step 6: Final answer
    x = 987.91

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1.5x scale

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.