Home / 81,186.10-121,779.15-72,729.70

Finding the Fourth Proportional to 81,186.10, 121,779.15 and 72,729.70

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Solution

The fourth proportional to 81,186.10, 121,779.15 and 72,729.70 is: 109,094.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,186.10 : 121,779.15 = 72,729.70 : x
  2. Step 2: Convert to fraction form
    81,186.10/121,779.15 = 72,729.70/x
  3. Step 3: Cross multiply
    81,186.10x = 121,779.15 × 72,729.70
  4. Step 4: Simplify right side
    81,186.10x = 8,856,961,045.76
  5. Step 5: Solve for x
    x = 8,856,961,045.76/81,186.10
  6. Step 6: Final answer
    x = 109,094.55

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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.