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Finding the Fourth Proportional to 809.96, 1,212.18 and 501.68

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Solution

The fourth proportional to 809.96, 1,212.18 and 501.68 is: 750.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.96 : 1,212.18 = 501.68 : x
  2. Step 2: Convert to fraction form
    809.96/1,212.18 = 501.68/x
  3. Step 3: Cross multiply
    809.96x = 1,212.18 × 501.68
  4. Step 4: Simplify right side
    809.96x = 608,126.46
  5. Step 5: Solve for x
    x = 608,126.46/809.96
  6. Step 6: Final answer
    x = 750.81

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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.