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Finding the Fourth Proportional to 85,418.67, 128,084.98 and 28,472.41

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Solution

The fourth proportional to 85,418.67, 128,084.98 and 28,472.41 is: 42,694.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,418.67 : 128,084.98 = 28,472.41 : x
  2. Step 2: Convert to fraction form
    85,418.67/128,084.98 = 28,472.41/x
  3. Step 3: Cross multiply
    85,418.67x = 128,084.98 × 28,472.41
  4. Step 4: Simplify right side
    85,418.67x = 3,646,888,065.40
  5. Step 5: Solve for x
    x = 3,646,888,065.40/85,418.67
  6. Step 6: Final answer
    x = 42,694.27

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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.