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Finding the Fourth Proportional to 90,811.20, 136,216.80 and 86,728.80

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Solution

The fourth proportional to 90,811.20, 136,216.80 and 86,728.80 is: 130,093.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,811.20 : 136,216.80 = 86,728.80 : x
  2. Step 2: Convert to fraction form
    90,811.20/136,216.80 = 86,728.80/x
  3. Step 3: Cross multiply
    90,811.20x = 136,216.80 × 86,728.80
  4. Step 4: Simplify right side
    90,811.20x = 11,813,919,603.84
  5. Step 5: Solve for x
    x = 11,813,919,603.84/90,811.20
  6. Step 6: Final answer
    x = 130,093.20

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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.