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Finding the Fourth Proportional to 716.60, 988.76 and 421.66

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Solution

The fourth proportional to 716.60, 988.76 and 421.66 is: 581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.60 : 988.76 = 421.66 : x
  2. Step 2: Convert to fraction form
    716.60/988.76 = 421.66/x
  3. Step 3: Cross multiply
    716.60x = 988.76 × 421.66
  4. Step 4: Simplify right side
    716.60x = 416,920.54
  5. Step 5: Solve for x
    x = 416,920.54/716.60
  6. Step 6: Final answer
    x = 581.80

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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.