Home / 81,000.10-121,447.35-72,705.70

Finding the Fourth Proportional to 81,000.10, 121,447.35 and 72,705.70

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Solution

The fourth proportional to 81,000.10, 121,447.35 and 72,705.70 is: 109,011.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.10 : 121,447.35 = 72,705.70 : x
  2. Step 2: Convert to fraction form
    81,000.10/121,447.35 = 72,705.70/x
  3. Step 3: Cross multiply
    81,000.10x = 121,447.35 × 72,705.70
  4. Step 4: Simplify right side
    81,000.10x = 8,829,914,594.90
  5. Step 5: Solve for x
    x = 8,829,914,594.90/81,000.10
  6. Step 6: Final answer
    x = 109,011.16

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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.