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Finding the Fourth Proportional to 128,752.20, 193,128.30 and 121,535.10

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Solution

The fourth proportional to 128,752.20, 193,128.30 and 121,535.10 is: 182,302.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,752.20 : 193,128.30 = 121,535.10 : x
  2. Step 2: Convert to fraction form
    128,752.20/193,128.30 = 121,535.10/x
  3. Step 3: Cross multiply
    128,752.20x = 193,128.30 × 121,535.10
  4. Step 4: Simplify right side
    128,752.20x = 23,471,867,253.33
  5. Step 5: Solve for x
    x = 23,471,867,253.33/128,752.20
  6. Step 6: Final answer
    x = 182,302.65

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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.