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Finding the Fourth Proportional to 137,307.20, 205,615.20 and 90,305.60

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Solution

The fourth proportional to 137,307.20, 205,615.20 and 90,305.60 is: 135,231.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,307.20 : 205,615.20 = 90,305.60 : x
  2. Step 2: Convert to fraction form
    137,307.20/205,615.20 = 90,305.60/x
  3. Step 3: Cross multiply
    137,307.20x = 205,615.20 × 90,305.60
  4. Step 4: Simplify right side
    137,307.20x = 18,568,204,005.12
  5. Step 5: Solve for x
    x = 18,568,204,005.12/137,307.20
  6. Step 6: Final answer
    x = 135,231.10

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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.