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Finding the Fourth Proportional to 139,970,998.80, 209,956,498.20 and 85,551,440.40

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Solution

The fourth proportional to 139,970,998.80, 209,956,498.20 and 85,551,440.40 is: 128,327,160.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,970,998.80 : 209,956,498.20 = 85,551,440.40 : x
  2. Step 2: Convert to fraction form
    139,970,998.80/209,956,498.20 = 85,551,440.40/x
  3. Step 3: Cross multiply
    139,970,998.80x = 209,956,498.20 × 85,551,440.40
  4. Step 4: Simplify right side
    139,970,998.80x = 17,962,080,842,350,008
  5. Step 5: Solve for x
    x = 17,962,080,842,350,008/139,970,998.80
  6. Step 6: Final answer
    x = 128,327,160.60

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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.