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Finding the Fourth Proportional to 81,437.80, 121,983.90 and 53,444.20

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Solution

The fourth proportional to 81,437.80, 121,983.90 and 53,444.20 is: 80,052.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,437.80 : 121,983.90 = 53,444.20 : x
  2. Step 2: Convert to fraction form
    81,437.80/121,983.90 = 53,444.20/x
  3. Step 3: Cross multiply
    81,437.80x = 121,983.90 × 53,444.20
  4. Step 4: Simplify right side
    81,437.80x = 6,519,331,948.38
  5. Step 5: Solve for x
    x = 6,519,331,948.38/81,437.80
  6. Step 6: Final answer
    x = 80,052.90

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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.