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Finding the Fourth Proportional to 78,003.90, 117,005.85 and 68,964.30

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Solution

The fourth proportional to 78,003.90, 117,005.85 and 68,964.30 is: 103,446.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,003.90 : 117,005.85 = 68,964.30 : x
  2. Step 2: Convert to fraction form
    78,003.90/117,005.85 = 68,964.30/x
  3. Step 3: Cross multiply
    78,003.90x = 117,005.85 × 68,964.30
  4. Step 4: Simplify right side
    78,003.90x = 8,069,226,541.16
  5. Step 5: Solve for x
    x = 8,069,226,541.16/78,003.90
  6. Step 6: Final answer
    x = 103,446.45

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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.