Home / 128,574.28-177,431.34-71,986.60

Finding the Fourth Proportional to 128,574.28, 177,431.34 and 71,986.60

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Solution

The fourth proportional to 128,574.28, 177,431.34 and 71,986.60 is: 99,340.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,574.28 : 177,431.34 = 71,986.60 : x
  2. Step 2: Convert to fraction form
    128,574.28/177,431.34 = 71,986.60/x
  3. Step 3: Cross multiply
    128,574.28x = 177,431.34 × 71,986.60
  4. Step 4: Simplify right side
    128,574.28x = 12,772,678,900.04
  5. Step 5: Solve for x
    x = 12,772,678,900.04/128,574.28
  6. Step 6: Final answer
    x = 99,340.85

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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.