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Finding the Fourth Proportional to 21,909.80, 30,250.13 and 12,960.18

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Solution

The fourth proportional to 21,909.80, 30,250.13 and 12,960.18 is: 17,893.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,909.80 : 30,250.13 = 12,960.18 : x
  2. Step 2: Convert to fraction form
    21,909.80/30,250.13 = 12,960.18/x
  3. Step 3: Cross multiply
    21,909.80x = 30,250.13 × 12,960.18
  4. Step 4: Simplify right side
    21,909.80x = 392,047,065.02
  5. Step 5: Solve for x
    x = 392,047,065.02/21,909.80
  6. Step 6: Final answer
    x = 17,893.68

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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.