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Finding the Fourth Proportional to 81,426.60, 122,139.90 and 28,841.40

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Solution

The fourth proportional to 81,426.60, 122,139.90 and 28,841.40 is: 43,262.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,426.60 : 122,139.90 = 28,841.40 : x
  2. Step 2: Convert to fraction form
    81,426.60/122,139.90 = 28,841.40/x
  3. Step 3: Cross multiply
    81,426.60x = 122,139.90 × 28,841.40
  4. Step 4: Simplify right side
    81,426.60x = 3,522,685,711.86
  5. Step 5: Solve for x
    x = 3,522,685,711.86/81,426.60
  6. Step 6: Final answer
    x = 43,262.10

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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.