Home / 90,781.20-136,171.80-84,876.30

Finding the Fourth Proportional to 90,781.20, 136,171.80 and 84,876.30

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Solution

The fourth proportional to 90,781.20, 136,171.80 and 84,876.30 is: 127,314.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,781.20 : 136,171.80 = 84,876.30 : x
  2. Step 2: Convert to fraction form
    90,781.20/136,171.80 = 84,876.30/x
  3. Step 3: Cross multiply
    90,781.20x = 136,171.80 × 84,876.30
  4. Step 4: Simplify right side
    90,781.20x = 11,557,758,548.34
  5. Step 5: Solve for x
    x = 11,557,758,548.34/90,781.20
  6. Step 6: Final answer
    x = 127,314.45

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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.