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Finding the Fourth Proportional to 521.57, 716 and 447.76

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Solution

The fourth proportional to 521.57, 716 and 447.76 is: 614.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.57 : 716 = 447.76 : x
  2. Step 2: Convert to fraction form
    521.57/716 = 447.76/x
  3. Step 3: Cross multiply
    521.57x = 716 × 447.76
  4. Step 4: Simplify right side
    521.57x = 320,596.16
  5. Step 5: Solve for x
    x = 320,596.16/521.57
  6. Step 6: Final answer
    x = 614.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.