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Finding the Fourth Proportional to 90,867.20, 136,300.80 and 85,035.20

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Solution

The fourth proportional to 90,867.20, 136,300.80 and 85,035.20 is: 127,552.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,867.20 : 136,300.80 = 85,035.20 : x
  2. Step 2: Convert to fraction form
    90,867.20/136,300.80 = 85,035.20/x
  3. Step 3: Cross multiply
    90,867.20x = 136,300.80 × 85,035.20
  4. Step 4: Simplify right side
    90,867.20x = 11,590,365,788.16
  5. Step 5: Solve for x
    x = 11,590,365,788.16/90,867.20
  6. Step 6: Final answer
    x = 127,552.80

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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.