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Finding the Fourth Proportional to 81,306.60, 121,830.30 and 60,311.40

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Solution

The fourth proportional to 81,306.60, 121,830.30 and 60,311.40 is: 90,370.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,306.60 : 121,830.30 = 60,311.40 : x
  2. Step 2: Convert to fraction form
    81,306.60/121,830.30 = 60,311.40/x
  3. Step 3: Cross multiply
    81,306.60x = 121,830.30 × 60,311.40
  4. Step 4: Simplify right side
    81,306.60x = 7,347,755,955.42
  5. Step 5: Solve for x
    x = 7,347,755,955.42/81,306.60
  6. Step 6: Final answer
    x = 90,370.97

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1.5x scale

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.