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Finding the Fourth Proportional to 78,864.60, 118,296.90 and 74,587.80

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Solution

The fourth proportional to 78,864.60, 118,296.90 and 74,587.80 is: 111,881.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,864.60 : 118,296.90 = 74,587.80 : x
  2. Step 2: Convert to fraction form
    78,864.60/118,296.90 = 74,587.80/x
  3. Step 3: Cross multiply
    78,864.60x = 118,296.90 × 74,587.80
  4. Step 4: Simplify right side
    78,864.60x = 8,823,505,517.82
  5. Step 5: Solve for x
    x = 8,823,505,517.82/78,864.60
  6. Step 6: Final answer
    x = 111,881.70

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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.