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Finding the Fourth Proportional to 21,471.68, 29,630.81 and 12,040.25

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Solution

The fourth proportional to 21,471.68, 29,630.81 and 12,040.25 is: 16,615.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,471.68 : 29,630.81 = 12,040.25 : x
  2. Step 2: Convert to fraction form
    21,471.68/29,630.81 = 12,040.25/x
  3. Step 3: Cross multiply
    21,471.68x = 29,630.81 × 12,040.25
  4. Step 4: Simplify right side
    21,471.68x = 356,762,242.05
  5. Step 5: Solve for x
    x = 356,762,242.05/21,471.68
  6. Step 6: Final answer
    x = 16,615.48

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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.