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Finding the Fourth Proportional to 128,329.48, 177,095.28 and 71,739.64

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Solution

The fourth proportional to 128,329.48, 177,095.28 and 71,739.64 is: 99,001.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,329.48 : 177,095.28 = 71,739.64 : x
  2. Step 2: Convert to fraction form
    128,329.48/177,095.28 = 71,739.64/x
  3. Step 3: Cross multiply
    128,329.48x = 177,095.28 × 71,739.64
  4. Step 4: Simplify right side
    128,329.48x = 12,704,751,632.90
  5. Step 5: Solve for x
    x = 12,704,751,632.90/128,329.48
  6. Step 6: Final answer
    x = 99,001.04

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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.