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Finding the Fourth Proportional to 72,912.10, 109,368.15 and 72,451.30

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Solution

The fourth proportional to 72,912.10, 109,368.15 and 72,451.30 is: 108,676.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,912.10 : 109,368.15 = 72,451.30 : x
  2. Step 2: Convert to fraction form
    72,912.10/109,368.15 = 72,451.30/x
  3. Step 3: Cross multiply
    72,912.10x = 109,368.15 × 72,451.30
  4. Step 4: Simplify right side
    72,912.10x = 7,923,864,646.10
  5. Step 5: Solve for x
    x = 7,923,864,646.10/72,912.10
  6. Step 6: Final answer
    x = 108,676.95

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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.