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Finding the Fourth Proportional to 251,805, 347,490.90 and 138,638.28

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Solution

The fourth proportional to 251,805, 347,490.90 and 138,638.28 is: 191,320.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,805 : 347,490.90 = 138,638.28 : x
  2. Step 2: Convert to fraction form
    251,805/347,490.90 = 138,638.28/x
  3. Step 3: Cross multiply
    251,805x = 347,490.90 × 138,638.28
  4. Step 4: Simplify right side
    251,805x = 48,175,540,691.65
  5. Step 5: Solve for x
    x = 48,175,540,691.65/251,805
  6. Step 6: Final answer
    x = 191,320.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.