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Finding the Fourth Proportional to 20,998,624.60, 28,978,095.90 and 11,340,832.60

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Solution

The fourth proportional to 20,998,624.60, 28,978,095.90 and 11,340,832.60 is: 15,650,345.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,998,624.60 : 28,978,095.90 = 11,340,832.60 : x
  2. Step 2: Convert to fraction form
    20,998,624.60/28,978,095.90 = 11,340,832.60/x
  3. Step 3: Cross multiply
    20,998,624.60x = 28,978,095.90 × 11,340,832.60
  4. Step 4: Simplify right side
    20,998,624.60x = 328,635,734,668,646.31
  5. Step 5: Solve for x
    x = 328,635,734,668,646.31/20,998,624.60
  6. Step 6: Final answer
    x = 15,650,345.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.