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Finding the Fourth Proportional to 512.60, 707.40 and 291.53

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Solution

The fourth proportional to 512.60, 707.40 and 291.53 is: 402.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.60 : 707.40 = 291.53 : x
  2. Step 2: Convert to fraction form
    512.60/707.40 = 291.53/x
  3. Step 3: Cross multiply
    512.60x = 707.40 × 291.53
  4. Step 4: Simplify right side
    512.60x = 206,228.32
  5. Step 5: Solve for x
    x = 206,228.32/512.60
  6. Step 6: Final answer
    x = 402.32

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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.