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Finding the Fourth Proportional to 80,005.60, 120,008.40 and 78,839.20

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Solution

The fourth proportional to 80,005.60, 120,008.40 and 78,839.20 is: 118,258.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,005.60 : 120,008.40 = 78,839.20 : x
  2. Step 2: Convert to fraction form
    80,005.60/120,008.40 = 78,839.20/x
  3. Step 3: Cross multiply
    80,005.60x = 120,008.40 × 78,839.20
  4. Step 4: Simplify right side
    80,005.60x = 9,461,366,249.28
  5. Step 5: Solve for x
    x = 9,461,366,249.28/80,005.60
  6. Step 6: Final answer
    x = 118,258.80

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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.