Home / 128,321.28-177,071.04-71,729.28

Finding the Fourth Proportional to 128,321.28, 177,071.04 and 71,729.28

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Solution

The fourth proportional to 128,321.28, 177,071.04 and 71,729.28 is: 98,979.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,321.28 : 177,071.04 = 71,729.28 : x
  2. Step 2: Convert to fraction form
    128,321.28/177,071.04 = 71,729.28/x
  3. Step 3: Cross multiply
    128,321.28x = 177,071.04 × 71,729.28
  4. Step 4: Simplify right side
    128,321.28x = 12,701,178,208.05
  5. Step 5: Solve for x
    x = 12,701,178,208.05/128,321.28
  6. Step 6: Final answer
    x = 98,979.52

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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.