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Finding the Fourth Proportional to 128,615.66, 177,490.86 and 71,256.20

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Solution

The fourth proportional to 128,615.66, 177,490.86 and 71,256.20 is: 98,334.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,615.66 : 177,490.86 = 71,256.20 : x
  2. Step 2: Convert to fraction form
    128,615.66/177,490.86 = 71,256.20/x
  3. Step 3: Cross multiply
    128,615.66x = 177,490.86 × 71,256.20
  4. Step 4: Simplify right side
    128,615.66x = 12,647,324,218.33
  5. Step 5: Solve for x
    x = 12,647,324,218.33/128,615.66
  6. Step 6: Final answer
    x = 98,334.25

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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.