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Finding the Fourth Proportional to 18,687,682.80, 28,039,397.40 and 10,174,129.20

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Solution

The fourth proportional to 18,687,682.80, 28,039,397.40 and 10,174,129.20 is: 15,265,480.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687,682.80 : 28,039,397.40 = 10,174,129.20 : x
  2. Step 2: Convert to fraction form
    18,687,682.80/28,039,397.40 = 10,174,129.20/x
  3. Step 3: Cross multiply
    18,687,682.80x = 28,039,397.40 × 10,174,129.20
  4. Step 4: Simplify right side
    18,687,682.80x = 285,276,451,837,744.06
  5. Step 5: Solve for x
    x = 285,276,451,837,744.06/18,687,682.80
  6. Step 6: Final answer
    x = 15,265,480.20

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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.