Home / 128,287.20-177,032.64-71,699.04

Finding the Fourth Proportional to 128,287.20, 177,032.64 and 71,699.04

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Solution

The fourth proportional to 128,287.20, 177,032.64 and 71,699.04 is: 98,942.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,287.20 : 177,032.64 = 71,699.04 : x
  2. Step 2: Convert to fraction form
    128,287.20/177,032.64 = 71,699.04/x
  3. Step 3: Cross multiply
    128,287.20x = 177,032.64 × 71,699.04
  4. Step 4: Simplify right side
    128,287.20x = 12,693,070,336.67
  5. Step 5: Solve for x
    x = 12,693,070,336.67/128,287.20
  6. Step 6: Final answer
    x = 98,942.61

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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.