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Finding the Fourth Proportional to 935.56, 1,291.14 and 521.56

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Solution

The fourth proportional to 935.56, 1,291.14 and 521.56 is: 719.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.56 : 1,291.14 = 521.56 : x
  2. Step 2: Convert to fraction form
    935.56/1,291.14 = 521.56/x
  3. Step 3: Cross multiply
    935.56x = 1,291.14 × 521.56
  4. Step 4: Simplify right side
    935.56x = 673,406.98
  5. Step 5: Solve for x
    x = 673,406.98/935.56
  6. Step 6: Final answer
    x = 719.79

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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.