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Finding the Fourth Proportional to 128,422.40, 192,633.60 and 115,332.80

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Solution

The fourth proportional to 128,422.40, 192,633.60 and 115,332.80 is: 172,999.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,422.40 : 192,633.60 = 115,332.80 : x
  2. Step 2: Convert to fraction form
    128,422.40/192,633.60 = 115,332.80/x
  3. Step 3: Cross multiply
    128,422.40x = 192,633.60 × 115,332.80
  4. Step 4: Simplify right side
    128,422.40x = 22,216,972,462.08
  5. Step 5: Solve for x
    x = 22,216,972,462.08/128,422.40
  6. Step 6: Final answer
    x = 172,999.20

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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.