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Finding the Fourth Proportional to 21,612.56, 29,820.80 and 13,119.12

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Solution

The fourth proportional to 21,612.56, 29,820.80 and 13,119.12 is: 18,101.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,612.56 : 29,820.80 = 13,119.12 : x
  2. Step 2: Convert to fraction form
    21,612.56/29,820.80 = 13,119.12/x
  3. Step 3: Cross multiply
    21,612.56x = 29,820.80 × 13,119.12
  4. Step 4: Simplify right side
    21,612.56x = 391,222,686.49
  5. Step 5: Solve for x
    x = 391,222,686.49/21,612.56
  6. Step 6: Final answer
    x = 18,101.64

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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.