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Finding the Fourth Proportional to 18,687,788.80, 28,039,556.40 and 10,174,235.20

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Solution

The fourth proportional to 18,687,788.80, 28,039,556.40 and 10,174,235.20 is: 15,265,639.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687,788.80 : 28,039,556.40 = 10,174,235.20 : x
  2. Step 2: Convert to fraction form
    18,687,788.80/28,039,556.40 = 10,174,235.20/x
  3. Step 3: Cross multiply
    18,687,788.80x = 28,039,556.40 × 10,174,235.20
  4. Step 4: Simplify right side
    18,687,788.80x = 285,281,041,717,265.25
  5. Step 5: Solve for x
    x = 285,281,041,717,265.25/18,687,788.80
  6. Step 6: Final answer
    x = 15,265,639.22

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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.