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Finding the Fourth Proportional to 308.79, 463.20 and 89.42

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Solution

The fourth proportional to 308.79, 463.20 and 89.42 is: 134.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.79 : 463.20 = 89.42 : x
  2. Step 2: Convert to fraction form
    308.79/463.20 = 89.42/x
  3. Step 3: Cross multiply
    308.79x = 463.20 × 89.42
  4. Step 4: Simplify right side
    308.79x = 41,417.03
  5. Step 5: Solve for x
    x = 41,417.03/308.79
  6. Step 6: Final answer
    x = 134.13

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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.