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Finding the Fourth Proportional to 21,610.88, 29,820.48 and 12,178.88

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Solution

The fourth proportional to 21,610.88, 29,820.48 and 12,178.88 is: 16,805.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,610.88 : 29,820.48 = 12,178.88 : x
  2. Step 2: Convert to fraction form
    21,610.88/29,820.48 = 12,178.88/x
  3. Step 3: Cross multiply
    21,610.88x = 29,820.48 × 12,178.88
  4. Step 4: Simplify right side
    21,610.88x = 363,180,047.46
  5. Step 5: Solve for x
    x = 363,180,047.46/21,610.88
  6. Step 6: Final answer
    x = 16,805.43

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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.