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Finding the Fourth Proportional to 90,640.80, 136,009.80 and 38,055.60

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Solution

The fourth proportional to 90,640.80, 136,009.80 and 38,055.60 is: 57,103.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,640.80 : 136,009.80 = 38,055.60 : x
  2. Step 2: Convert to fraction form
    90,640.80/136,009.80 = 38,055.60/x
  3. Step 3: Cross multiply
    90,640.80x = 136,009.80 × 38,055.60
  4. Step 4: Simplify right side
    90,640.80x = 5,175,934,544.88
  5. Step 5: Solve for x
    x = 5,175,934,544.88/90,640.80
  6. Step 6: Final answer
    x = 57,103.80

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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.