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Finding the Fourth Proportional to 955.42, 1,431.26 and 543.30

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Solution

The fourth proportional to 955.42, 1,431.26 and 543.30 is: 813.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.42 : 1,431.26 = 543.30 : x
  2. Step 2: Convert to fraction form
    955.42/1,431.26 = 543.30/x
  3. Step 3: Cross multiply
    955.42x = 1,431.26 × 543.30
  4. Step 4: Simplify right side
    955.42x = 777,603.56
  5. Step 5: Solve for x
    x = 777,603.56/955.42
  6. Step 6: Final answer
    x = 813.89

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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.