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Finding the Fourth Proportional to 128,091.90, 176,759.48 and 71,506.86

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Solution

The fourth proportional to 128,091.90, 176,759.48 and 71,506.86 is: 98,675.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,091.90 : 176,759.48 = 71,506.86 : x
  2. Step 2: Convert to fraction form
    128,091.90/176,759.48 = 71,506.86/x
  3. Step 3: Cross multiply
    128,091.90x = 176,759.48 × 71,506.86
  4. Step 4: Simplify right side
    128,091.90x = 12,639,515,390.03
  5. Step 5: Solve for x
    x = 12,639,515,390.03/128,091.90
  6. Step 6: Final answer
    x = 98,675.37

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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.