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Finding the Fourth Proportional to 81,280.80, 121,921.20 and 34,624.80

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Solution

The fourth proportional to 81,280.80, 121,921.20 and 34,624.80 is: 51,937.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,280.80 : 121,921.20 = 34,624.80 : x
  2. Step 2: Convert to fraction form
    81,280.80/121,921.20 = 34,624.80/x
  3. Step 3: Cross multiply
    81,280.80x = 121,921.20 × 34,624.80
  4. Step 4: Simplify right side
    81,280.80x = 4,221,497,165.76
  5. Step 5: Solve for x
    x = 4,221,497,165.76/81,280.80
  6. Step 6: Final answer
    x = 51,937.20

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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.