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Finding the Fourth Proportional to 40,993.61, 61,492.64 and 12,915.87

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Solution

The fourth proportional to 40,993.61, 61,492.64 and 12,915.87 is: 19,374.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,993.61 : 61,492.64 = 12,915.87 : x
  2. Step 2: Convert to fraction form
    40,993.61/61,492.64 = 12,915.87/x
  3. Step 3: Cross multiply
    40,993.61x = 61,492.64 × 12,915.87
  4. Step 4: Simplify right side
    40,993.61x = 794,230,879.62
  5. Step 5: Solve for x
    x = 794,230,879.62/40,993.61
  6. Step 6: Final answer
    x = 19,374.51

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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.