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Finding the Fourth Proportional to 128,415.90, 177,326.55 and 80,751.90

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Solution

The fourth proportional to 128,415.90, 177,326.55 and 80,751.90 is: 111,508.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,415.90 : 177,326.55 = 80,751.90 : x
  2. Step 2: Convert to fraction form
    128,415.90/177,326.55 = 80,751.90/x
  3. Step 3: Cross multiply
    128,415.90x = 177,326.55 × 80,751.90
  4. Step 4: Simplify right side
    128,415.90x = 14,319,455,832.95
  5. Step 5: Solve for x
    x = 14,319,455,832.95/128,415.90
  6. Step 6: Final answer
    x = 111,508.43

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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.