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Finding the Fourth Proportional to 21,681.81, 29,921.13 and 12,729.42

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Solution

The fourth proportional to 21,681.81, 29,921.13 and 12,729.42 is: 17,566.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,681.81 : 29,921.13 = 12,729.42 : x
  2. Step 2: Convert to fraction form
    21,681.81/29,921.13 = 12,729.42/x
  3. Step 3: Cross multiply
    21,681.81x = 29,921.13 × 12,729.42
  4. Step 4: Simplify right side
    21,681.81x = 380,878,630.64
  5. Step 5: Solve for x
    x = 380,878,630.64/21,681.81
  6. Step 6: Final answer
    x = 17,566.74

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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.