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Finding the Fourth Proportional to 40,920.72, 61,369.20 and 14,611.20

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Solution

The fourth proportional to 40,920.72, 61,369.20 and 14,611.20 is: 21,912.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,920.72 : 61,369.20 = 14,611.20 : x
  2. Step 2: Convert to fraction form
    40,920.72/61,369.20 = 14,611.20/x
  3. Step 3: Cross multiply
    40,920.72x = 61,369.20 × 14,611.20
  4. Step 4: Simplify right side
    40,920.72x = 896,677,655.04
  5. Step 5: Solve for x
    x = 896,677,655.04/40,920.72
  6. Step 6: Final answer
    x = 21,912.56

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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.