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Finding the Fourth Proportional to 78,857.64, 118,079.10 and 60,402.60

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Solution

The fourth proportional to 78,857.64, 118,079.10 and 60,402.60 is: 90,445.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,857.64 : 118,079.10 = 60,402.60 : x
  2. Step 2: Convert to fraction form
    78,857.64/118,079.10 = 60,402.60/x
  3. Step 3: Cross multiply
    78,857.64x = 118,079.10 × 60,402.60
  4. Step 4: Simplify right side
    78,857.64x = 7,132,284,645.66
  5. Step 5: Solve for x
    x = 7,132,284,645.66/78,857.64
  6. Step 6: Final answer
    x = 90,445.07

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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.