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Finding the Fourth Proportional to 109,660.40, 164,231.40 and 74,409.20

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Solution

The fourth proportional to 109,660.40, 164,231.40 and 74,409.20 is: 111,437.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,660.40 : 164,231.40 = 74,409.20 : x
  2. Step 2: Convert to fraction form
    109,660.40/164,231.40 = 74,409.20/x
  3. Step 3: Cross multiply
    109,660.40x = 164,231.40 × 74,409.20
  4. Step 4: Simplify right side
    109,660.40x = 12,220,327,088.88
  5. Step 5: Solve for x
    x = 12,220,327,088.88/109,660.40
  6. Step 6: Final answer
    x = 111,437.92

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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.