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Finding the Fourth Proportional to 81,280, 121,809.30 and 45,758.26

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Solution

The fourth proportional to 81,280, 121,809.30 and 45,758.26 is: 68,575.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,280 : 121,809.30 = 45,758.26 : x
  2. Step 2: Convert to fraction form
    81,280/121,809.30 = 45,758.26/x
  3. Step 3: Cross multiply
    81,280x = 121,809.30 × 45,758.26
  4. Step 4: Simplify right side
    81,280x = 5,573,781,619.82
  5. Step 5: Solve for x
    x = 5,573,781,619.82/81,280
  6. Step 6: Final answer
    x = 68,575.07

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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.