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Finding the Fourth Proportional to 206,856,803.60, 310,285,205.40 and 91,719,126.80

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Solution

The fourth proportional to 206,856,803.60, 310,285,205.40 and 91,719,126.80 is: 137,578,690.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,856,803.60 : 310,285,205.40 = 91,719,126.80 : x
  2. Step 2: Convert to fraction form
    206,856,803.60/310,285,205.40 = 91,719,126.80/x
  3. Step 3: Cross multiply
    206,856,803.60x = 310,285,205.40 × 91,719,126.80
  4. Step 4: Simplify right side
    206,856,803.60x = 28,459,088,098,246,640
  5. Step 5: Solve for x
    x = 28,459,088,098,246,640/206,856,803.60
  6. Step 6: Final answer
    x = 137,578,690.20

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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.