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Finding the Fourth Proportional to 861.22, 1,292.74 and 536.81

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Solution

The fourth proportional to 861.22, 1,292.74 and 536.81 is: 805.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.22 : 1,292.74 = 536.81 : x
  2. Step 2: Convert to fraction form
    861.22/1,292.74 = 536.81/x
  3. Step 3: Cross multiply
    861.22x = 1,292.74 × 536.81
  4. Step 4: Simplify right side
    861.22x = 693,955.76
  5. Step 5: Solve for x
    x = 693,955.76/861.22
  6. Step 6: Final answer
    x = 805.78

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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.