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Finding the Fourth Proportional to 716.78, 987.54 and 671.42

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Solution

The fourth proportional to 716.78, 987.54 and 671.42 is: 925.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.78 : 987.54 = 671.42 : x
  2. Step 2: Convert to fraction form
    716.78/987.54 = 671.42/x
  3. Step 3: Cross multiply
    716.78x = 987.54 × 671.42
  4. Step 4: Simplify right side
    716.78x = 663,054.11
  5. Step 5: Solve for x
    x = 663,054.11/716.78
  6. Step 6: Final answer
    x = 925.05

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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.