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Finding the Fourth Proportional to 128,950.80, 177,943.20 and 71,585.64

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Solution

The fourth proportional to 128,950.80, 177,943.20 and 71,585.64 is: 98,783.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,950.80 : 177,943.20 = 71,585.64 : x
  2. Step 2: Convert to fraction form
    128,950.80/177,943.20 = 71,585.64/x
  3. Step 3: Cross multiply
    128,950.80x = 177,943.20 × 71,585.64
  4. Step 4: Simplify right side
    128,950.80x = 12,738,177,855.65
  5. Step 5: Solve for x
    x = 12,738,177,855.65/128,950.80
  6. Step 6: Final answer
    x = 98,783.24

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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.