Home / 21,129.75-29,158.99-12,177.17

Finding the Fourth Proportional to 21,129.75, 29,158.99 and 12,177.17

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Solution

The fourth proportional to 21,129.75, 29,158.99 and 12,177.17 is: 16,804.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.75 : 29,158.99 = 12,177.17 : x
  2. Step 2: Convert to fraction form
    21,129.75/29,158.99 = 12,177.17/x
  3. Step 3: Cross multiply
    21,129.75x = 29,158.99 × 12,177.17
  4. Step 4: Simplify right side
    21,129.75x = 355,073,978.26
  5. Step 5: Solve for x
    x = 355,073,978.26/21,129.75
  6. Step 6: Final answer
    x = 16,804.46

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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.