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Finding the Fourth Proportional to 86,428.50, 129,642.75 and 20,764.50

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Solution

The fourth proportional to 86,428.50, 129,642.75 and 20,764.50 is: 31,146.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,428.50 : 129,642.75 = 20,764.50 : x
  2. Step 2: Convert to fraction form
    86,428.50/129,642.75 = 20,764.50/x
  3. Step 3: Cross multiply
    86,428.50x = 129,642.75 × 20,764.50
  4. Step 4: Simplify right side
    86,428.50x = 2,691,966,882.38
  5. Step 5: Solve for x
    x = 2,691,966,882.38/86,428.50
  6. Step 6: Final answer
    x = 31,146.75

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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.