Home / 21,400.88-29,520.84-12,897.20

Finding the Fourth Proportional to 21,400.88, 29,520.84 and 12,897.20

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Solution

The fourth proportional to 21,400.88, 29,520.84 and 12,897.20 is: 17,790.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,400.88 : 29,520.84 = 12,897.20 : x
  2. Step 2: Convert to fraction form
    21,400.88/29,520.84 = 12,897.20/x
  3. Step 3: Cross multiply
    21,400.88x = 29,520.84 × 12,897.20
  4. Step 4: Simplify right side
    21,400.88x = 380,736,177.65
  5. Step 5: Solve for x
    x = 380,736,177.65/21,400.88
  6. Step 6: Final answer
    x = 17,790.68

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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.