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Finding the Fourth Proportional to 512.60, 707.45 and 291.57

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Solution

The fourth proportional to 512.60, 707.45 and 291.57 is: 402.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.60 : 707.45 = 291.57 : x
  2. Step 2: Convert to fraction form
    512.60/707.45 = 291.57/x
  3. Step 3: Cross multiply
    512.60x = 707.45 × 291.57
  4. Step 4: Simplify right side
    512.60x = 206,273.69
  5. Step 5: Solve for x
    x = 206,273.69/512.60
  6. Step 6: Final answer
    x = 402.40

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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.