Home / 21,279.33-29,369.93-12,781.85

Finding the Fourth Proportional to 21,279.33, 29,369.93 and 12,781.85

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Solution

The fourth proportional to 21,279.33, 29,369.93 and 12,781.85 is: 17,641.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.33 : 29,369.93 = 12,781.85 : x
  2. Step 2: Convert to fraction form
    21,279.33/29,369.93 = 12,781.85/x
  3. Step 3: Cross multiply
    21,279.33x = 29,369.93 × 12,781.85
  4. Step 4: Simplify right side
    21,279.33x = 375,401,829.01
  5. Step 5: Solve for x
    x = 375,401,829.01/21,279.33
  6. Step 6: Final answer
    x = 17,641.62

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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.