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Finding the Fourth Proportional to 949.38, 1,421.71 and 812.22

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Solution

The fourth proportional to 949.38, 1,421.71 and 812.22 is: 1,216.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.38 : 1,421.71 = 812.22 : x
  2. Step 2: Convert to fraction form
    949.38/1,421.71 = 812.22/x
  3. Step 3: Cross multiply
    949.38x = 1,421.71 × 812.22
  4. Step 4: Simplify right side
    949.38x = 1,154,741.30
  5. Step 5: Solve for x
    x = 1,154,741.30/949.38
  6. Step 6: Final answer
    x = 1,216.31

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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.