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Finding the Fourth Proportional to 1,240.78, 1,712 and 716.72

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Solution

The fourth proportional to 1,240.78, 1,712 and 716.72 is: 988.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.78 : 1,712 = 716.72 : x
  2. Step 2: Convert to fraction form
    1,240.78/1,712 = 716.72/x
  3. Step 3: Cross multiply
    1,240.78x = 1,712 × 716.72
  4. Step 4: Simplify right side
    1,240.78x = 1,227,024.64
  5. Step 5: Solve for x
    x = 1,227,024.64/1,240.78
  6. Step 6: Final answer
    x = 988.91

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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.