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Finding the Fourth Proportional to 128,601.40, 177,469.76 and 72,013.20

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Solution

The fourth proportional to 128,601.40, 177,469.76 and 72,013.20 is: 99,378.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,601.40 : 177,469.76 = 72,013.20 : x
  2. Step 2: Convert to fraction form
    128,601.40/177,469.76 = 72,013.20/x
  3. Step 3: Cross multiply
    128,601.40x = 177,469.76 × 72,013.20
  4. Step 4: Simplify right side
    128,601.40x = 12,780,165,320.83
  5. Step 5: Solve for x
    x = 12,780,165,320.83/128,601.40
  6. Step 6: Final answer
    x = 99,378.12

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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.