Home / 90,721.20-136,065.60-57,381.60

Finding the Fourth Proportional to 90,721.20, 136,065.60 and 57,381.60

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Solution

The fourth proportional to 90,721.20, 136,065.60 and 57,381.60 is: 86,062.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,721.20 : 136,065.60 = 57,381.60 : x
  2. Step 2: Convert to fraction form
    90,721.20/136,065.60 = 57,381.60/x
  3. Step 3: Cross multiply
    90,721.20x = 136,065.60 × 57,381.60
  4. Step 4: Simplify right side
    90,721.20x = 7,807,661,832.96
  5. Step 5: Solve for x
    x = 7,807,661,832.96/90,721.20
  6. Step 6: Final answer
    x = 86,062.15

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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.