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Finding the Fourth Proportional to 128,077.52, 176,742.60 and 71,487.44

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Solution

The fourth proportional to 128,077.52, 176,742.60 and 71,487.44 is: 98,650.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,077.52 : 176,742.60 = 71,487.44 : x
  2. Step 2: Convert to fraction form
    128,077.52/176,742.60 = 71,487.44/x
  3. Step 3: Cross multiply
    128,077.52x = 176,742.60 × 71,487.44
  4. Step 4: Simplify right side
    128,077.52x = 12,634,876,012.94
  5. Step 5: Solve for x
    x = 12,634,876,012.94/128,077.52
  6. Step 6: Final answer
    x = 98,650.22

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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.