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Finding the Fourth Proportional to 213,630, 320,499.72 and 80,511.36

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Solution

The fourth proportional to 213,630, 320,499.72 and 80,511.36 is: 120,787.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,630 : 320,499.72 = 80,511.36 : x
  2. Step 2: Convert to fraction form
    213,630/320,499.72 = 80,511.36/x
  3. Step 3: Cross multiply
    213,630x = 320,499.72 × 80,511.36
  4. Step 4: Simplify right side
    213,630x = 25,803,868,336.82
  5. Step 5: Solve for x
    x = 25,803,868,336.82/213,630
  6. Step 6: Final answer
    x = 120,787.66

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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.