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Finding the Fourth Proportional to 935.76, 1,291.34 and 521.76

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Solution

The fourth proportional to 935.76, 1,291.34 and 521.76 is: 720.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.76 : 1,291.34 = 521.76 : x
  2. Step 2: Convert to fraction form
    935.76/1,291.34 = 521.76/x
  3. Step 3: Cross multiply
    935.76x = 1,291.34 × 521.76
  4. Step 4: Simplify right side
    935.76x = 673,769.56
  5. Step 5: Solve for x
    x = 673,769.56/935.76
  6. Step 6: Final answer
    x = 720.02

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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.