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Finding the Fourth Proportional to 78,635.77, 117,855.29 and 61,929.83

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Solution

The fourth proportional to 78,635.77, 117,855.29 and 61,929.83 is: 92,817.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,635.77 : 117,855.29 = 61,929.83 : x
  2. Step 2: Convert to fraction form
    78,635.77/117,855.29 = 61,929.83/x
  3. Step 3: Cross multiply
    78,635.77x = 117,855.29 × 61,929.83
  4. Step 4: Simplify right side
    78,635.77x = 7,298,758,074.30
  5. Step 5: Solve for x
    x = 7,298,758,074.30/78,635.77
  6. Step 6: Final answer
    x = 92,817.28

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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.