Home / 21,240.04-29,312-11,680.65

Finding the Fourth Proportional to 21,240.04, 29,312 and 11,680.65

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Solution

The fourth proportional to 21,240.04, 29,312 and 11,680.65 is: 16,119.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240.04 : 29,312 = 11,680.65 : x
  2. Step 2: Convert to fraction form
    21,240.04/29,312 = 11,680.65/x
  3. Step 3: Cross multiply
    21,240.04x = 29,312 × 11,680.65
  4. Step 4: Simplify right side
    21,240.04x = 342,383,212.80
  5. Step 5: Solve for x
    x = 342,383,212.80/21,240.04
  6. Step 6: Final answer
    x = 16,119.71

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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.