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Finding the Fourth Proportional to 716.25, 987.89 and 495.57

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Solution

The fourth proportional to 716.25, 987.89 and 495.57 is: 683.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.25 : 987.89 = 495.57 : x
  2. Step 2: Convert to fraction form
    716.25/987.89 = 495.57/x
  3. Step 3: Cross multiply
    716.25x = 987.89 × 495.57
  4. Step 4: Simplify right side
    716.25x = 489,566.17
  5. Step 5: Solve for x
    x = 489,566.17/716.25
  6. Step 6: Final answer
    x = 683.51

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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.