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Finding the Fourth Proportional to 128,443.50, 177,252.12 and 71,868.24

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Solution

The fourth proportional to 128,443.50, 177,252.12 and 71,868.24 is: 99,178.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,443.50 : 177,252.12 = 71,868.24 : x
  2. Step 2: Convert to fraction form
    128,443.50/177,252.12 = 71,868.24/x
  3. Step 3: Cross multiply
    128,443.50x = 177,252.12 × 71,868.24
  4. Step 4: Simplify right side
    128,443.50x = 12,738,797,900.67
  5. Step 5: Solve for x
    x = 12,738,797,900.67/128,443.50
  6. Step 6: Final answer
    x = 99,178.22

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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.