Home / 21,100.20-29,113.52-12,600.78

Finding the Fourth Proportional to 21,100.20, 29,113.52 and 12,600.78

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Solution

The fourth proportional to 21,100.20, 29,113.52 and 12,600.78 is: 17,386.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,100.20 : 29,113.52 = 12,600.78 : x
  2. Step 2: Convert to fraction form
    21,100.20/29,113.52 = 12,600.78/x
  3. Step 3: Cross multiply
    21,100.20x = 29,113.52 × 12,600.78
  4. Step 4: Simplify right side
    21,100.20x = 366,853,060.55
  5. Step 5: Solve for x
    x = 366,853,060.55/21,100.20
  6. Step 6: Final answer
    x = 17,386.24

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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.