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Finding the Fourth Proportional to 935.21, 1,290.44 and 542.16

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Solution

The fourth proportional to 935.21, 1,290.44 and 542.16 is: 748.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.21 : 1,290.44 = 542.16 : x
  2. Step 2: Convert to fraction form
    935.21/1,290.44 = 542.16/x
  3. Step 3: Cross multiply
    935.21x = 1,290.44 × 542.16
  4. Step 4: Simplify right side
    935.21x = 699,626.31
  5. Step 5: Solve for x
    x = 699,626.31/935.21
  6. Step 6: Final answer
    x = 748.09

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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.