Home / 128,986.30-177,990.91-71,620.21

Finding the Fourth Proportional to 128,986.30, 177,990.91 and 71,620.21

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Solution

The fourth proportional to 128,986.30, 177,990.91 and 71,620.21 is: 98,830.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,986.30 : 177,990.91 = 71,620.21 : x
  2. Step 2: Convert to fraction form
    128,986.30/177,990.91 = 71,620.21/x
  3. Step 3: Cross multiply
    128,986.30x = 177,990.91 × 71,620.21
  4. Step 4: Simplify right side
    128,986.30x = 12,747,746,352.29
  5. Step 5: Solve for x
    x = 12,747,746,352.29/128,986.30
  6. Step 6: Final answer
    x = 98,830.24

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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.