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Finding the Fourth Proportional to 716.61, 988.68 and 495.48

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Solution

The fourth proportional to 716.61, 988.68 and 495.48 is: 683.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.61 : 988.68 = 495.48 : x
  2. Step 2: Convert to fraction form
    716.61/988.68 = 495.48/x
  3. Step 3: Cross multiply
    716.61x = 988.68 × 495.48
  4. Step 4: Simplify right side
    716.61x = 489,871.17
  5. Step 5: Solve for x
    x = 489,871.17/716.61
  6. Step 6: Final answer
    x = 683.60

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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.