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Finding the Fourth Proportional to 78,839.20, 118,258.80 and 28,902.70

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Solution

The fourth proportional to 78,839.20, 118,258.80 and 28,902.70 is: 43,354.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,839.20 : 118,258.80 = 28,902.70 : x
  2. Step 2: Convert to fraction form
    78,839.20/118,258.80 = 28,902.70/x
  3. Step 3: Cross multiply
    78,839.20x = 118,258.80 × 28,902.70
  4. Step 4: Simplify right side
    78,839.20x = 3,417,998,618.76
  5. Step 5: Solve for x
    x = 3,417,998,618.76/78,839.20
  6. Step 6: Final answer
    x = 43,354.05

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1.5x scale

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.