Home / 90,821.70-136,232.55-86,739.30

Finding the Fourth Proportional to 90,821.70, 136,232.55 and 86,739.30

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Solution

The fourth proportional to 90,821.70, 136,232.55 and 86,739.30 is: 130,108.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,821.70 : 136,232.55 = 86,739.30 : x
  2. Step 2: Convert to fraction form
    90,821.70/136,232.55 = 86,739.30/x
  3. Step 3: Cross multiply
    90,821.70x = 136,232.55 × 86,739.30
  4. Step 4: Simplify right side
    90,821.70x = 11,816,716,024.22
  5. Step 5: Solve for x
    x = 11,816,716,024.22/90,821.70
  6. Step 6: Final answer
    x = 130,108.95

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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.