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Finding the Fourth Proportional to 78,599.86, 117,859.74 and 38,621.50

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Solution

The fourth proportional to 78,599.86, 117,859.74 and 38,621.50 is: 57,912.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,599.86 : 117,859.74 = 38,621.50 : x
  2. Step 2: Convert to fraction form
    78,599.86/117,859.74 = 38,621.50/x
  3. Step 3: Cross multiply
    78,599.86x = 117,859.74 × 38,621.50
  4. Step 4: Simplify right side
    78,599.86x = 4,551,919,948.41
  5. Step 5: Solve for x
    x = 4,551,919,948.41/78,599.86
  6. Step 6: Final answer
    x = 57,912.57

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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.