Home / 21,111.81-29,134.85-12,728.85

Finding the Fourth Proportional to 21,111.81, 29,134.85 and 12,728.85

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Solution

The fourth proportional to 21,111.81, 29,134.85 and 12,728.85 is: 17,566.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.81 : 29,134.85 = 12,728.85 : x
  2. Step 2: Convert to fraction form
    21,111.81/29,134.85 = 12,728.85/x
  3. Step 3: Cross multiply
    21,111.81x = 29,134.85 × 12,728.85
  4. Step 4: Simplify right side
    21,111.81x = 370,853,135.42
  5. Step 5: Solve for x
    x = 370,853,135.42/21,111.81
  6. Step 6: Final answer
    x = 17,566.15

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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.