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Finding the Fourth Proportional to 18,721,808.60, 28,082,712.90 and 15,887,456.60

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Solution

The fourth proportional to 18,721,808.60, 28,082,712.90 and 15,887,456.60 is: 23,831,184.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721,808.60 : 28,082,712.90 = 15,887,456.60 : x
  2. Step 2: Convert to fraction form
    18,721,808.60/28,082,712.90 = 15,887,456.60/x
  3. Step 3: Cross multiply
    18,721,808.60x = 28,082,712.90 × 15,887,456.60
  4. Step 4: Simplify right side
    18,721,808.60x = 446,162,882,409,010.12
  5. Step 5: Solve for x
    x = 446,162,882,409,010.12/18,721,808.60
  6. Step 6: Final answer
    x = 23,831,184.90

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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.