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Finding the Fourth Proportional to 943.20, 1,302.30 and 869.22

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Solution

The fourth proportional to 943.20, 1,302.30 and 869.22 is: 1,200.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.20 : 1,302.30 = 869.22 : x
  2. Step 2: Convert to fraction form
    943.20/1,302.30 = 869.22/x
  3. Step 3: Cross multiply
    943.20x = 1,302.30 × 869.22
  4. Step 4: Simplify right side
    943.20x = 1,131,985.21
  5. Step 5: Solve for x
    x = 1,131,985.21/943.20
  6. Step 6: Final answer
    x = 1,200.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.