Home / 78,724.60-118,101.30-31,982.20

Finding the Fourth Proportional to 78,724.60, 118,101.30 and 31,982.20

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Solution

The fourth proportional to 78,724.60, 118,101.30 and 31,982.20 is: 47,979.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,724.60 : 118,101.30 = 31,982.20 : x
  2. Step 2: Convert to fraction form
    78,724.60/118,101.30 = 31,982.20/x
  3. Step 3: Cross multiply
    78,724.60x = 118,101.30 × 31,982.20
  4. Step 4: Simplify right side
    78,724.60x = 3,777,139,396.86
  5. Step 5: Solve for x
    x = 3,777,139,396.86/78,724.60
  6. Step 6: Final answer
    x = 47,979.15

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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.