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Finding the Fourth Proportional to 21,191.54, 29,245.65 and 12,240.68

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Solution

The fourth proportional to 21,191.54, 29,245.65 and 12,240.68 is: 16,892.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,191.54 : 29,245.65 = 12,240.68 : x
  2. Step 2: Convert to fraction form
    21,191.54/29,245.65 = 12,240.68/x
  3. Step 3: Cross multiply
    21,191.54x = 29,245.65 × 12,240.68
  4. Step 4: Simplify right side
    21,191.54x = 357,986,643.04
  5. Step 5: Solve for x
    x = 357,986,643.04/21,191.54
  6. Step 6: Final answer
    x = 16,892.90

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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.