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Finding the Fourth Proportional to 21,353.78, 29,468.12 and 12,401.66

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Solution

The fourth proportional to 21,353.78, 29,468.12 and 12,401.66 is: 17,114.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,353.78 : 29,468.12 = 12,401.66 : x
  2. Step 2: Convert to fraction form
    21,353.78/29,468.12 = 12,401.66/x
  3. Step 3: Cross multiply
    21,353.78x = 29,468.12 × 12,401.66
  4. Step 4: Simplify right side
    21,353.78x = 365,453,605.08
  5. Step 5: Solve for x
    x = 365,453,605.08/21,353.78
  6. Step 6: Final answer
    x = 17,114.23

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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.