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Finding the Fourth Proportional to 83.60, 125.20 and 56.40

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Solution

The fourth proportional to 83.60, 125.20 and 56.40 is: 84.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.60 : 125.20 = 56.40 : x
  2. Step 2: Convert to fraction form
    83.60/125.20 = 56.40/x
  3. Step 3: Cross multiply
    83.60x = 125.20 × 56.40
  4. Step 4: Simplify right side
    83.60x = 7,061.28
  5. Step 5: Solve for x
    x = 7,061.28/83.60
  6. Step 6: Final answer
    x = 84.47

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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.