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Finding the Fourth Proportional to 109,318.80, 163,978.20 and 67,328.40

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Solution

The fourth proportional to 109,318.80, 163,978.20 and 67,328.40 is: 100,992.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,318.80 : 163,978.20 = 67,328.40 : x
  2. Step 2: Convert to fraction form
    109,318.80/163,978.20 = 67,328.40/x
  3. Step 3: Cross multiply
    109,318.80x = 163,978.20 × 67,328.40
  4. Step 4: Simplify right side
    109,318.80x = 11,040,389,840.88
  5. Step 5: Solve for x
    x = 11,040,389,840.88/109,318.80
  6. Step 6: Final answer
    x = 100,992.60

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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.