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Finding the Fourth Proportional to 128,389.12, 177,185.52 and 71,797.12

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Solution

The fourth proportional to 128,389.12, 177,185.52 and 71,797.12 is: 99,084.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,389.12 : 177,185.52 = 71,797.12 : x
  2. Step 2: Convert to fraction form
    128,389.12/177,185.52 = 71,797.12/x
  3. Step 3: Cross multiply
    128,389.12x = 177,185.52 × 71,797.12
  4. Step 4: Simplify right side
    128,389.12x = 12,721,410,041.70
  5. Step 5: Solve for x
    x = 12,721,410,041.70/128,389.12
  6. Step 6: Final answer
    x = 99,084.80

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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.