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Finding the Fourth Proportional to 280,117.89, 420,112.85 and 80,436.69

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Solution

The fourth proportional to 280,117.89, 420,112.85 and 80,436.69 is: 120,636.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,117.89 : 420,112.85 = 80,436.69 : x
  2. Step 2: Convert to fraction form
    280,117.89/420,112.85 = 80,436.69/x
  3. Step 3: Cross multiply
    280,117.89x = 420,112.85 × 80,436.69
  4. Step 4: Simplify right side
    280,117.89x = 33,792,486,678.28
  5. Step 5: Solve for x
    x = 33,792,486,678.28/280,117.89
  6. Step 6: Final answer
    x = 120,636.66

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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.