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Finding the Fourth Proportional to 128,260.40, 192,487.80 and 83,872.40

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Solution

The fourth proportional to 128,260.40, 192,487.80 and 83,872.40 is: 125,872.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,260.40 : 192,487.80 = 83,872.40 : x
  2. Step 2: Convert to fraction form
    128,260.40/192,487.80 = 83,872.40/x
  3. Step 3: Cross multiply
    128,260.40x = 192,487.80 × 83,872.40
  4. Step 4: Simplify right side
    128,260.40x = 16,144,413,756.72
  5. Step 5: Solve for x
    x = 16,144,413,756.72/128,260.40
  6. Step 6: Final answer
    x = 125,872.16

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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.