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Finding the Fourth Proportional to 251,781.12, 347,445.12 and 138,582.08

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Solution

The fourth proportional to 251,781.12, 347,445.12 and 138,582.08 is: 191,236.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,781.12 : 347,445.12 = 138,582.08 : x
  2. Step 2: Convert to fraction form
    251,781.12/347,445.12 = 138,582.08/x
  3. Step 3: Cross multiply
    251,781.12x = 347,445.12 × 138,582.08
  4. Step 4: Simplify right side
    251,781.12x = 48,149,667,415.45
  5. Step 5: Solve for x
    x = 48,149,667,415.45/251,781.12
  6. Step 6: Final answer
    x = 191,236.21

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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.