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Finding the Fourth Proportional to 21,398.78, 29,523.10 and 12,438.92

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Solution

The fourth proportional to 21,398.78, 29,523.10 and 12,438.92 is: 17,161.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,398.78 : 29,523.10 = 12,438.92 : x
  2. Step 2: Convert to fraction form
    21,398.78/29,523.10 = 12,438.92/x
  3. Step 3: Cross multiply
    21,398.78x = 29,523.10 × 12,438.92
  4. Step 4: Simplify right side
    21,398.78x = 367,235,379.02
  5. Step 5: Solve for x
    x = 367,235,379.02/21,398.78
  6. Step 6: Final answer
    x = 17,161.51

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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.