Home / 21,391.39-29,521.22-12,318.10

Finding the Fourth Proportional to 21,391.39, 29,521.22 and 12,318.10

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Solution

The fourth proportional to 21,391.39, 29,521.22 and 12,318.10 is: 16,999.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,391.39 : 29,521.22 = 12,318.10 : x
  2. Step 2: Convert to fraction form
    21,391.39/29,521.22 = 12,318.10/x
  3. Step 3: Cross multiply
    21,391.39x = 29,521.22 × 12,318.10
  4. Step 4: Simplify right side
    21,391.39x = 363,645,218.63
  5. Step 5: Solve for x
    x = 363,645,218.63/21,391.39
  6. Step 6: Final answer
    x = 16,999.61

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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.