Home / 81,432.78-121,349.46-78,757.08

Finding the Fourth Proportional to 81,432.78, 121,349.46 and 78,757.08

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Solution

The fourth proportional to 81,432.78, 121,349.46 and 78,757.08 is: 117,362.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,432.78 : 121,349.46 = 78,757.08 : x
  2. Step 2: Convert to fraction form
    81,432.78/121,349.46 = 78,757.08/x
  3. Step 3: Cross multiply
    81,432.78x = 121,349.46 × 78,757.08
  4. Step 4: Simplify right side
    81,432.78x = 9,557,129,129.18
  5. Step 5: Solve for x
    x = 9,557,129,129.18/81,432.78
  6. Step 6: Final answer
    x = 117,362.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.