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Finding the Fourth Proportional to 66,915.78, 100,373.59 and 20,168.65

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Solution

The fourth proportional to 66,915.78, 100,373.59 and 20,168.65 is: 30,252.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,915.78 : 100,373.59 = 20,168.65 : x
  2. Step 2: Convert to fraction form
    66,915.78/100,373.59 = 20,168.65/x
  3. Step 3: Cross multiply
    66,915.78x = 100,373.59 × 20,168.65
  4. Step 4: Simplify right side
    66,915.78x = 2,024,399,805.95
  5. Step 5: Solve for x
    x = 2,024,399,805.95/66,915.78
  6. Step 6: Final answer
    x = 30,252.95

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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.