Home / 21,108.19-29,129.78-12,154.25

Finding the Fourth Proportional to 21,108.19, 29,129.78 and 12,154.25

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Solution

The fourth proportional to 21,108.19, 29,129.78 and 12,154.25 is: 16,773.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.19 : 29,129.78 = 12,154.25 : x
  2. Step 2: Convert to fraction form
    21,108.19/29,129.78 = 12,154.25/x
  3. Step 3: Cross multiply
    21,108.19x = 29,129.78 × 12,154.25
  4. Step 4: Simplify right side
    21,108.19x = 354,050,513.30
  5. Step 5: Solve for x
    x = 354,050,513.30/21,108.19
  6. Step 6: Final answer
    x = 16,773.14

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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.