Home / 81,486.72-121,429.92-78,811.20

Finding the Fourth Proportional to 81,486.72, 121,429.92 and 78,811.20

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Solution

The fourth proportional to 81,486.72, 121,429.92 and 78,811.20 is: 117,442.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,486.72 : 121,429.92 = 78,811.20 : x
  2. Step 2: Convert to fraction form
    81,486.72/121,429.92 = 78,811.20/x
  3. Step 3: Cross multiply
    81,486.72x = 121,429.92 × 78,811.20
  4. Step 4: Simplify right side
    81,486.72x = 9,570,037,711.10
  5. Step 5: Solve for x
    x = 9,570,037,711.10/81,486.72
  6. Step 6: Final answer
    x = 117,442.91

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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.