Home / 90,762.20-136,143.30-86,679.80

Finding the Fourth Proportional to 90,762.20, 136,143.30 and 86,679.80

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Solution

The fourth proportional to 90,762.20, 136,143.30 and 86,679.80 is: 130,019.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,762.20 : 136,143.30 = 86,679.80 : x
  2. Step 2: Convert to fraction form
    90,762.20/136,143.30 = 86,679.80/x
  3. Step 3: Cross multiply
    90,762.20x = 136,143.30 × 86,679.80
  4. Step 4: Simplify right side
    90,762.20x = 11,800,874,015.34
  5. Step 5: Solve for x
    x = 11,800,874,015.34/90,762.20
  6. Step 6: Final answer
    x = 130,019.70

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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.