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Finding the Fourth Proportional to 128,712.80, 192,680.40 and 113,160.80

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Solution

The fourth proportional to 128,712.80, 192,680.40 and 113,160.80 is: 169,399.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,712.80 : 192,680.40 = 113,160.80 : x
  2. Step 2: Convert to fraction form
    128,712.80/192,680.40 = 113,160.80/x
  3. Step 3: Cross multiply
    128,712.80x = 192,680.40 × 113,160.80
  4. Step 4: Simplify right side
    128,712.80x = 21,803,868,208.32
  5. Step 5: Solve for x
    x = 21,803,868,208.32/128,712.80
  6. Step 6: Final answer
    x = 169,399.38

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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.