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Finding the Fourth Proportional to 86,515.72, 129,773.58 and 20,851.72

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Solution

The fourth proportional to 86,515.72, 129,773.58 and 20,851.72 is: 31,277.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,515.72 : 129,773.58 = 20,851.72 : x
  2. Step 2: Convert to fraction form
    86,515.72/129,773.58 = 20,851.72/x
  3. Step 3: Cross multiply
    86,515.72x = 129,773.58 × 20,851.72
  4. Step 4: Simplify right side
    86,515.72x = 2,706,002,353.56
  5. Step 5: Solve for x
    x = 2,706,002,353.56/86,515.72
  6. Step 6: Final answer
    x = 31,277.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.