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Finding the Fourth Proportional to 90,905.60, 136,230.40 and 72,217.60

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Solution

The fourth proportional to 90,905.60, 136,230.40 and 72,217.60 is: 108,224.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,905.60 : 136,230.40 = 72,217.60 : x
  2. Step 2: Convert to fraction form
    90,905.60/136,230.40 = 72,217.60/x
  3. Step 3: Cross multiply
    90,905.60x = 136,230.40 × 72,217.60
  4. Step 4: Simplify right side
    90,905.60x = 9,838,232,535.04
  5. Step 5: Solve for x
    x = 9,838,232,535.04/90,905.60
  6. Step 6: Final answer
    x = 108,224.71

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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.