Home / 21,580.40-29,781.96-13,082.78

Finding the Fourth Proportional to 21,580.40, 29,781.96 and 13,082.78

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Solution

The fourth proportional to 21,580.40, 29,781.96 and 13,082.78 is: 18,054.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,580.40 : 29,781.96 = 13,082.78 : x
  2. Step 2: Convert to fraction form
    21,580.40/29,781.96 = 13,082.78/x
  3. Step 3: Cross multiply
    21,580.40x = 29,781.96 × 13,082.78
  4. Step 4: Simplify right side
    21,580.40x = 389,630,830.65
  5. Step 5: Solve for x
    x = 389,630,830.65/21,580.40
  6. Step 6: Final answer
    x = 18,054.85

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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.