Home / 128,579.50-177,439.51-71,990.88

Finding the Fourth Proportional to 128,579.50, 177,439.51 and 71,990.88

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Solution

The fourth proportional to 128,579.50, 177,439.51 and 71,990.88 is: 99,347.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,579.50 : 177,439.51 = 71,990.88 : x
  2. Step 2: Convert to fraction form
    128,579.50/177,439.51 = 71,990.88/x
  3. Step 3: Cross multiply
    128,579.50x = 177,439.51 × 71,990.88
  4. Step 4: Simplify right side
    128,579.50x = 12,774,025,896.26
  5. Step 5: Solve for x
    x = 12,774,025,896.26/128,579.50
  6. Step 6: Final answer
    x = 99,347.30

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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.