Home / 21,680.19-29,921.45-12,728.48

Finding the Fourth Proportional to 21,680.19, 29,921.45 and 12,728.48

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Solution

The fourth proportional to 21,680.19, 29,921.45 and 12,728.48 is: 17,566.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,680.19 : 29,921.45 = 12,728.48 : x
  2. Step 2: Convert to fraction form
    21,680.19/29,921.45 = 12,728.48/x
  3. Step 3: Cross multiply
    21,680.19x = 29,921.45 × 12,728.48
  4. Step 4: Simplify right side
    21,680.19x = 380,854,364.65
  5. Step 5: Solve for x
    x = 380,854,364.65/21,680.19
  6. Step 6: Final answer
    x = 17,566.93

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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.