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Finding the Fourth Proportional to 410.22, 615.32 and 128.79

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Solution

The fourth proportional to 410.22, 615.32 and 128.79 is: 193.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.22 : 615.32 = 128.79 : x
  2. Step 2: Convert to fraction form
    410.22/615.32 = 128.79/x
  3. Step 3: Cross multiply
    410.22x = 615.32 × 128.79
  4. Step 4: Simplify right side
    410.22x = 79,246.42
  5. Step 5: Solve for x
    x = 79,246.42/410.22
  6. Step 6: Final answer
    x = 193.18

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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.