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Finding the Fourth Proportional to 206,956,908.80, 310,435,363.20 and 70,646,739.20

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Solution

The fourth proportional to 206,956,908.80, 310,435,363.20 and 70,646,739.20 is: 105,970,108.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,956,908.80 : 310,435,363.20 = 70,646,739.20 : x
  2. Step 2: Convert to fraction form
    206,956,908.80/310,435,363.20 = 70,646,739.20/x
  3. Step 3: Cross multiply
    206,956,908.80x = 310,435,363.20 × 70,646,739.20
  4. Step 4: Simplify right side
    206,956,908.80x = 21,931,246,142,447,676
  5. Step 5: Solve for x
    x = 21,931,246,142,447,676/206,956,908.80
  6. Step 6: Final answer
    x = 105,970,108.80

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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.