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Finding the Fourth Proportional to 128,861.98, 177,838.41 and 72,277

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Solution

The fourth proportional to 128,861.98, 177,838.41 and 72,277 is: 99,747.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,861.98 : 177,838.41 = 72,277 : x
  2. Step 2: Convert to fraction form
    128,861.98/177,838.41 = 72,277/x
  3. Step 3: Cross multiply
    128,861.98x = 177,838.41 × 72,277
  4. Step 4: Simplify right side
    128,861.98x = 12,853,626,759.57
  5. Step 5: Solve for x
    x = 12,853,626,759.57/128,861.98
  6. Step 6: Final answer
    x = 99,747.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.