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Finding the Fourth Proportional to 31,807,939.20, 47,711,908.80 and 7,873,411.20

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Solution

The fourth proportional to 31,807,939.20, 47,711,908.80 and 7,873,411.20 is: 11,810,116.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,807,939.20 : 47,711,908.80 = 7,873,411.20 : x
  2. Step 2: Convert to fraction form
    31,807,939.20/47,711,908.80 = 7,873,411.20/x
  3. Step 3: Cross multiply
    31,807,939.20x = 47,711,908.80 × 7,873,411.20
  4. Step 4: Simplify right side
    31,807,939.20x = 375,655,477,119,298.56
  5. Step 5: Solve for x
    x = 375,655,477,119,298.56/31,807,939.20
  6. Step 6: Final answer
    x = 11,810,116.80

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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.