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Finding the Fourth Proportional to 109,021.30, 163,531.95 and 85,401.70

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Solution

The fourth proportional to 109,021.30, 163,531.95 and 85,401.70 is: 128,102.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,021.30 : 163,531.95 = 85,401.70 : x
  2. Step 2: Convert to fraction form
    109,021.30/163,531.95 = 85,401.70/x
  3. Step 3: Cross multiply
    109,021.30x = 163,531.95 × 85,401.70
  4. Step 4: Simplify right side
    109,021.30x = 13,965,906,534.32
  5. Step 5: Solve for x
    x = 13,965,906,534.32/109,021.30
  6. Step 6: Final answer
    x = 128,102.55

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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.