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Finding the Fourth Proportional to 85,824.95, 128,715.88 and 40,818.53

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Solution

The fourth proportional to 85,824.95, 128,715.88 and 40,818.53 is: 61,217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,824.95 : 128,715.88 = 40,818.53 : x
  2. Step 2: Convert to fraction form
    85,824.95/128,715.88 = 40,818.53/x
  3. Step 3: Cross multiply
    85,824.95x = 128,715.88 × 40,818.53
  4. Step 4: Simplify right side
    85,824.95x = 5,253,992,805.16
  5. Step 5: Solve for x
    x = 5,253,992,805.16/85,824.95
  6. Step 6: Final answer
    x = 61,217.55

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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.