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Finding the Fourth Proportional to 15,338,978.76, 21,168,233.62 and 8,463,903.68

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Solution

The fourth proportional to 15,338,978.76, 21,168,233.62 and 8,463,903.68 is: 11,680,431.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,338,978.76 : 21,168,233.62 = 8,463,903.68 : x
  2. Step 2: Convert to fraction form
    15,338,978.76/21,168,233.62 = 8,463,903.68/x
  3. Step 3: Cross multiply
    15,338,978.76x = 21,168,233.62 × 8,463,903.68
  4. Step 4: Simplify right side
    15,338,978.76x = 179,165,890,435,417.72
  5. Step 5: Solve for x
    x = 179,165,890,435,417.72/15,338,978.76
  6. Step 6: Final answer
    x = 11,680,431.48

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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.