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Finding the Fourth Proportional to 128,385.76, 192,539.76 and 34,879.36

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Solution

The fourth proportional to 128,385.76, 192,539.76 and 34,879.36 is: 52,308.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,385.76 : 192,539.76 = 34,879.36 : x
  2. Step 2: Convert to fraction form
    128,385.76/192,539.76 = 34,879.36/x
  3. Step 3: Cross multiply
    128,385.76x = 192,539.76 × 34,879.36
  4. Step 4: Simplify right side
    128,385.76x = 6,715,663,603.35
  5. Step 5: Solve for x
    x = 6,715,663,603.35/128,385.76
  6. Step 6: Final answer
    x = 52,308.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.