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Finding the Fourth Proportional to 156,990.60, 216,651.12 and 85,374.80

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Solution

The fourth proportional to 156,990.60, 216,651.12 and 85,374.80 is: 117,819.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,990.60 : 216,651.12 = 85,374.80 : x
  2. Step 2: Convert to fraction form
    156,990.60/216,651.12 = 85,374.80/x
  3. Step 3: Cross multiply
    156,990.60x = 216,651.12 × 85,374.80
  4. Step 4: Simplify right side
    156,990.60x = 18,496,546,039.78
  5. Step 5: Solve for x
    x = 18,496,546,039.78/156,990.60
  6. Step 6: Final answer
    x = 117,819.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.