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Finding the Fourth Proportional to 112,781.88, 155,638.90 and 61,797.90

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Solution

The fourth proportional to 112,781.88, 155,638.90 and 61,797.90 is: 85,281.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,781.88 : 155,638.90 = 61,797.90 : x
  2. Step 2: Convert to fraction form
    112,781.88/155,638.90 = 61,797.90/x
  3. Step 3: Cross multiply
    112,781.88x = 155,638.90 × 61,797.90
  4. Step 4: Simplify right side
    112,781.88x = 9,618,157,178.31
  5. Step 5: Solve for x
    x = 9,618,157,178.31/112,781.88
  6. Step 6: Final answer
    x = 85,281.05

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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.