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Finding the Fourth Proportional to 21,643.98, 29,868.84 and 12,691.65

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Solution

The fourth proportional to 21,643.98, 29,868.84 and 12,691.65 is: 17,514.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,643.98 : 29,868.84 = 12,691.65 : x
  2. Step 2: Convert to fraction form
    21,643.98/29,868.84 = 12,691.65/x
  3. Step 3: Cross multiply
    21,643.98x = 29,868.84 × 12,691.65
  4. Step 4: Simplify right side
    21,643.98x = 379,084,863.19
  5. Step 5: Solve for x
    x = 379,084,863.19/21,643.98
  6. Step 6: Final answer
    x = 17,514.56

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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.