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Finding the Fourth Proportional to 128,175.40, 176,876.58 and 71,585.80

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Solution

The fourth proportional to 128,175.40, 176,876.58 and 71,585.80 is: 98,785.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,175.40 : 176,876.58 = 71,585.80 : x
  2. Step 2: Convert to fraction form
    128,175.40/176,876.58 = 71,585.80/x
  3. Step 3: Cross multiply
    128,175.40x = 176,876.58 × 71,585.80
  4. Step 4: Simplify right side
    128,175.40x = 12,661,851,480.56
  5. Step 5: Solve for x
    x = 12,661,851,480.56/128,175.40
  6. Step 6: Final answer
    x = 98,785.35

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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.