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Finding the Fourth Proportional to 128,648.58, 177,532.38 and 71,287.41

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Solution

The fourth proportional to 128,648.58, 177,532.38 and 71,287.41 is: 98,375.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,648.58 : 177,532.38 = 71,287.41 : x
  2. Step 2: Convert to fraction form
    128,648.58/177,532.38 = 71,287.41/x
  3. Step 3: Cross multiply
    128,648.58x = 177,532.38 × 71,287.41
  4. Step 4: Simplify right side
    128,648.58x = 12,655,823,561.34
  5. Step 5: Solve for x
    x = 12,655,823,561.34/128,648.58
  6. Step 6: Final answer
    x = 98,375.15

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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.