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Finding the Fourth Proportional to 210,357,829.60, 315,387,445.20 and 80,915,423.20

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Solution

The fourth proportional to 210,357,829.60, 315,387,445.20 and 80,915,423.20 is: 121,315,705.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,357,829.60 : 315,387,445.20 = 80,915,423.20 : x
  2. Step 2: Convert to fraction form
    210,357,829.60/315,387,445.20 = 80,915,423.20/x
  3. Step 3: Cross multiply
    210,357,829.60x = 315,387,445.20 × 80,915,423.20
  4. Step 4: Simplify right side
    210,357,829.60x = 25,519,708,600,324,808
  5. Step 5: Solve for x
    x = 25,519,708,600,324,808/210,357,829.60
  6. Step 6: Final answer
    x = 121,315,705.95

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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.