Home / 128,211.12-191,980.20-90,567.60

Finding the Fourth Proportional to 128,211.12, 191,980.20 and 90,567.60

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Solution

The fourth proportional to 128,211.12, 191,980.20 and 90,567.60 is: 135,613.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,211.12 : 191,980.20 = 90,567.60 : x
  2. Step 2: Convert to fraction form
    128,211.12/191,980.20 = 90,567.60/x
  3. Step 3: Cross multiply
    128,211.12x = 191,980.20 × 90,567.60
  4. Step 4: Simplify right side
    128,211.12x = 17,387,185,961.52
  5. Step 5: Solve for x
    x = 17,387,185,961.52/128,211.12
  6. Step 6: Final answer
    x = 135,613.71

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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.