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Finding the Fourth Proportional to 128,474, 177,294.16 and 71,896.32

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Solution

The fourth proportional to 128,474, 177,294.16 and 71,896.32 is: 99,216.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,474 : 177,294.16 = 71,896.32 : x
  2. Step 2: Convert to fraction form
    128,474/177,294.16 = 71,896.32/x
  3. Step 3: Cross multiply
    128,474x = 177,294.16 × 71,896.32
  4. Step 4: Simplify right side
    128,474x = 12,746,797,661.49
  5. Step 5: Solve for x
    x = 12,746,797,661.49/128,474
  6. Step 6: Final answer
    x = 99,216.94

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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.