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Finding the Fourth Proportional to 716.72, 988.99 and 417.90

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Solution

The fourth proportional to 716.72, 988.99 and 417.90 is: 576.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.72 : 988.99 = 417.90 : x
  2. Step 2: Convert to fraction form
    716.72/988.99 = 417.90/x
  3. Step 3: Cross multiply
    716.72x = 988.99 × 417.90
  4. Step 4: Simplify right side
    716.72x = 413,298.92
  5. Step 5: Solve for x
    x = 413,298.92/716.72
  6. Step 6: Final answer
    x = 576.65

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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.