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Finding the Fourth Proportional to 205,915.40, 309,045.90 and 100,824.20

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Solution

The fourth proportional to 205,915.40, 309,045.90 and 100,824.20 is: 151,320.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,915.40 : 309,045.90 = 100,824.20 : x
  2. Step 2: Convert to fraction form
    205,915.40/309,045.90 = 100,824.20/x
  3. Step 3: Cross multiply
    205,915.40x = 309,045.90 × 100,824.20
  4. Step 4: Simplify right side
    205,915.40x = 31,159,305,630.78
  5. Step 5: Solve for x
    x = 31,159,305,630.78/205,915.40
  6. Step 6: Final answer
    x = 151,320.91

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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.