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Finding the Fourth Proportional to 478.88, 718.31 and 136.88

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Solution

The fourth proportional to 478.88, 718.31 and 136.88 is: 205.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.88 : 718.31 = 136.88 : x
  2. Step 2: Convert to fraction form
    478.88/718.31 = 136.88/x
  3. Step 3: Cross multiply
    478.88x = 718.31 × 136.88
  4. Step 4: Simplify right side
    478.88x = 98,319.02
  5. Step 5: Solve for x
    x = 98,319.02/478.88
  6. Step 6: Final answer
    x = 205.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.