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Finding the Fourth Proportional to 692.18, 955.17 and 393.45

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Solution

The fourth proportional to 692.18, 955.17 and 393.45 is: 542.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.18 : 955.17 = 393.45 : x
  2. Step 2: Convert to fraction form
    692.18/955.17 = 393.45/x
  3. Step 3: Cross multiply
    692.18x = 955.17 × 393.45
  4. Step 4: Simplify right side
    692.18x = 375,811.64
  5. Step 5: Solve for x
    x = 375,811.64/692.18
  6. Step 6: Final answer
    x = 542.94

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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.