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Finding the Fourth Proportional to 18,152,868.80, 27,191,978.40 and 12,479,499.20

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Solution

The fourth proportional to 18,152,868.80, 27,191,978.40 and 12,479,499.20 is: 18,693,589.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,152,868.80 : 27,191,978.40 = 12,479,499.20 : x
  2. Step 2: Convert to fraction form
    18,152,868.80/27,191,978.40 = 12,479,499.20/x
  3. Step 3: Cross multiply
    18,152,868.80x = 27,191,978.40 × 12,479,499.20
  4. Step 4: Simplify right side
    18,152,868.80x = 339,342,272,689,217.25
  5. Step 5: Solve for x
    x = 339,342,272,689,217.25/18,152,868.80
  6. Step 6: Final answer
    x = 18,693,589.23

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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.