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Finding the Fourth Proportional to 78,604.10, 117,832.04 and 39,123.90

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Solution

The fourth proportional to 78,604.10, 117,832.04 and 39,123.90 is: 58,648.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,604.10 : 117,832.04 = 39,123.90 : x
  2. Step 2: Convert to fraction form
    78,604.10/117,832.04 = 39,123.90/x
  3. Step 3: Cross multiply
    78,604.10x = 117,832.04 × 39,123.90
  4. Step 4: Simplify right side
    78,604.10x = 4,610,048,949.76
  5. Step 5: Solve for x
    x = 4,610,048,949.76/78,604.10
  6. Step 6: Final answer
    x = 58,648.96

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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.