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Finding the Fourth Proportional to 128,430.40, 192,645.60 and 115,340.80

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Solution

The fourth proportional to 128,430.40, 192,645.60 and 115,340.80 is: 173,011.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,430.40 : 192,645.60 = 115,340.80 : x
  2. Step 2: Convert to fraction form
    128,430.40/192,645.60 = 115,340.80/x
  3. Step 3: Cross multiply
    128,430.40x = 192,645.60 × 115,340.80
  4. Step 4: Simplify right side
    128,430.40x = 22,219,897,620.48
  5. Step 5: Solve for x
    x = 22,219,897,620.48/128,430.40
  6. Step 6: Final answer
    x = 173,011.20

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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.