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Finding the Fourth Proportional to 809.62, 1,212.68 and 501.55

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Solution

The fourth proportional to 809.62, 1,212.68 and 501.55 is: 751.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.62 : 1,212.68 = 501.55 : x
  2. Step 2: Convert to fraction form
    809.62/1,212.68 = 501.55/x
  3. Step 3: Cross multiply
    809.62x = 1,212.68 × 501.55
  4. Step 4: Simplify right side
    809.62x = 608,217.15
  5. Step 5: Solve for x
    x = 608,217.15/809.62
  6. Step 6: Final answer
    x = 751.24

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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.