Home / 21,138.64-29,172.18-11,707.20

Finding the Fourth Proportional to 21,138.64, 29,172.18 and 11,707.20

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Solution

The fourth proportional to 21,138.64, 29,172.18 and 11,707.20 is: 16,156.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.64 : 29,172.18 = 11,707.20 : x
  2. Step 2: Convert to fraction form
    21,138.64/29,172.18 = 11,707.20/x
  3. Step 3: Cross multiply
    21,138.64x = 29,172.18 × 11,707.20
  4. Step 4: Simplify right side
    21,138.64x = 341,524,545.70
  5. Step 5: Solve for x
    x = 341,524,545.70/21,138.64
  6. Step 6: Final answer
    x = 16,156.41

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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.