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Finding the Fourth Proportional to 128,308.32, 192,396.76 and 68,370.95

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Solution

The fourth proportional to 128,308.32, 192,396.76 and 68,370.95 is: 102,521.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,308.32 : 192,396.76 = 68,370.95 : x
  2. Step 2: Convert to fraction form
    128,308.32/192,396.76 = 68,370.95/x
  3. Step 3: Cross multiply
    128,308.32x = 192,396.76 × 68,370.95
  4. Step 4: Simplify right side
    128,308.32x = 13,154,349,258.12
  5. Step 5: Solve for x
    x = 13,154,349,258.12/128,308.32
  6. Step 6: Final answer
    x = 102,521.41

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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.