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Finding the Fourth Proportional to 78,492.67, 108,605.12 and 68,442.05

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Solution

The fourth proportional to 78,492.67, 108,605.12 and 68,442.05 is: 94,698.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,492.67 : 108,605.12 = 68,442.05 : x
  2. Step 2: Convert to fraction form
    78,492.67/108,605.12 = 68,442.05/x
  3. Step 3: Cross multiply
    78,492.67x = 108,605.12 × 68,442.05
  4. Step 4: Simplify right side
    78,492.67x = 7,433,156,982.60
  5. Step 5: Solve for x
    x = 7,433,156,982.60/78,492.67
  6. Step 6: Final answer
    x = 94,698.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.