Home / 81,430.22-121,902.86-72,877.35

Finding the Fourth Proportional to 81,430.22, 121,902.86 and 72,877.35

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Solution

The fourth proportional to 81,430.22, 121,902.86 and 72,877.35 is: 109,099.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,430.22 : 121,902.86 = 72,877.35 : x
  2. Step 2: Convert to fraction form
    81,430.22/121,902.86 = 72,877.35/x
  3. Step 3: Cross multiply
    81,430.22x = 121,902.86 × 72,877.35
  4. Step 4: Simplify right side
    81,430.22x = 8,883,957,394.22
  5. Step 5: Solve for x
    x = 8,883,957,394.22/81,430.22
  6. Step 6: Final answer
    x = 109,099.02

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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.