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Finding the Fourth Proportional to 90,762.40, 136,028.40 and 80,855.20

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Solution

The fourth proportional to 90,762.40, 136,028.40 and 80,855.20 is: 121,180.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,762.40 : 136,028.40 = 80,855.20 : x
  2. Step 2: Convert to fraction form
    90,762.40/136,028.40 = 80,855.20/x
  3. Step 3: Cross multiply
    90,762.40x = 136,028.40 × 80,855.20
  4. Step 4: Simplify right side
    90,762.40x = 10,998,603,487.68
  5. Step 5: Solve for x
    x = 10,998,603,487.68/90,762.40
  6. Step 6: Final answer
    x = 121,180.17

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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.