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Finding the Fourth Proportional to 81,061.20, 121,534.20 and 36,709.20

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Solution

The fourth proportional to 81,061.20, 121,534.20 and 36,709.20 is: 55,037.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,061.20 : 121,534.20 = 36,709.20 : x
  2. Step 2: Convert to fraction form
    81,061.20/121,534.20 = 36,709.20/x
  3. Step 3: Cross multiply
    81,061.20x = 121,534.20 × 36,709.20
  4. Step 4: Simplify right side
    81,061.20x = 4,461,423,254.64
  5. Step 5: Solve for x
    x = 4,461,423,254.64/81,061.20
  6. Step 6: Final answer
    x = 55,037.72

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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.