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Finding the Fourth Proportional to 15,156.72, 20,918.43 and 8,442.99

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Solution

The fourth proportional to 15,156.72, 20,918.43 and 8,442.99 is: 11,652.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,156.72 : 20,918.43 = 8,442.99 : x
  2. Step 2: Convert to fraction form
    15,156.72/20,918.43 = 8,442.99/x
  3. Step 3: Cross multiply
    15,156.72x = 20,918.43 × 8,442.99
  4. Step 4: Simplify right side
    15,156.72x = 176,614,095.31
  5. Step 5: Solve for x
    x = 176,614,095.31/15,156.72
  6. Step 6: Final answer
    x = 11,652.53

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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.