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Finding the Fourth Proportional to 15,474.78, 21,354.90 and 8,401.05

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Solution

The fourth proportional to 15,474.78, 21,354.90 and 8,401.05 is: 11,593.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,474.78 : 21,354.90 = 8,401.05 : x
  2. Step 2: Convert to fraction form
    15,474.78/21,354.90 = 8,401.05/x
  3. Step 3: Cross multiply
    15,474.78x = 21,354.90 × 8,401.05
  4. Step 4: Simplify right side
    15,474.78x = 179,403,582.65
  5. Step 5: Solve for x
    x = 179,403,582.65/15,474.78
  6. Step 6: Final answer
    x = 11,593.29

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1.5x scale

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.