Home / 21,107.81-29,126.25-12,158.24

Finding the Fourth Proportional to 21,107.81, 29,126.25 and 12,158.24

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Solution

The fourth proportional to 21,107.81, 29,126.25 and 12,158.24 is: 16,776.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,107.81 : 29,126.25 = 12,158.24 : x
  2. Step 2: Convert to fraction form
    21,107.81/29,126.25 = 12,158.24/x
  3. Step 3: Cross multiply
    21,107.81x = 29,126.25 × 12,158.24
  4. Step 4: Simplify right side
    21,107.81x = 354,123,792.17
  5. Step 5: Solve for x
    x = 354,123,792.17/21,107.81
  6. Step 6: Final answer
    x = 16,776.91

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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.