Home / 21,561.60-29,753.76-12,129.76

Finding the Fourth Proportional to 21,561.60, 29,753.76 and 12,129.76

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Solution

The fourth proportional to 21,561.60, 29,753.76 and 12,129.76 is: 16,738.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,561.60 : 29,753.76 = 12,129.76 : x
  2. Step 2: Convert to fraction form
    21,561.60/29,753.76 = 12,129.76/x
  3. Step 3: Cross multiply
    21,561.60x = 29,753.76 × 12,129.76
  4. Step 4: Simplify right side
    21,561.60x = 360,905,967.90
  5. Step 5: Solve for x
    x = 360,905,967.90/21,561.60
  6. Step 6: Final answer
    x = 16,738.37

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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.