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Finding the Fourth Proportional to 78,495.80, 108,609.46 and 68,445.20

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Solution

The fourth proportional to 78,495.80, 108,609.46 and 68,445.20 is: 94,703.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,495.80 : 108,609.46 = 68,445.20 : x
  2. Step 2: Convert to fraction form
    78,495.80/108,609.46 = 68,445.20/x
  3. Step 3: Cross multiply
    78,495.80x = 108,609.46 × 68,445.20
  4. Step 4: Simplify right side
    78,495.80x = 7,433,796,211.59
  5. Step 5: Solve for x
    x = 7,433,796,211.59/78,495.80
  6. Step 6: Final answer
    x = 94,703.11

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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.