Home / 21,391.69-29,508.68-12,438.20

Finding the Fourth Proportional to 21,391.69, 29,508.68 and 12,438.20

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Solution

The fourth proportional to 21,391.69, 29,508.68 and 12,438.20 is: 17,157.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,391.69 : 29,508.68 = 12,438.20 : x
  2. Step 2: Convert to fraction form
    21,391.69/29,508.68 = 12,438.20/x
  3. Step 3: Cross multiply
    21,391.69x = 29,508.68 × 12,438.20
  4. Step 4: Simplify right side
    21,391.69x = 367,034,727.61
  5. Step 5: Solve for x
    x = 367,034,727.61/21,391.69
  6. Step 6: Final answer
    x = 17,157.82

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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.