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Finding the Fourth Proportional to 21,656.38, 29,885.80 and 11,720.38

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Solution

The fourth proportional to 21,656.38, 29,885.80 and 11,720.38 is: 16,174.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,656.38 : 29,885.80 = 11,720.38 : x
  2. Step 2: Convert to fraction form
    21,656.38/29,885.80 = 11,720.38/x
  3. Step 3: Cross multiply
    21,656.38x = 29,885.80 × 11,720.38
  4. Step 4: Simplify right side
    21,656.38x = 350,272,783.18
  5. Step 5: Solve for x
    x = 350,272,783.18/21,656.38
  6. Step 6: Final answer
    x = 16,174.12

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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.