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Finding the Fourth Proportional to 67,920.40, 101,880.60 and 18,672.40

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Solution

The fourth proportional to 67,920.40, 101,880.60 and 18,672.40 is: 28,008.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,920.40 : 101,880.60 = 18,672.40 : x
  2. Step 2: Convert to fraction form
    67,920.40/101,880.60 = 18,672.40/x
  3. Step 3: Cross multiply
    67,920.40x = 101,880.60 × 18,672.40
  4. Step 4: Simplify right side
    67,920.40x = 1,902,355,315.44
  5. Step 5: Solve for x
    x = 1,902,355,315.44/67,920.40
  6. Step 6: Final answer
    x = 28,008.60

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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.