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Finding the Fourth Proportional to 958.74, 1,438.62 and 520.31

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Solution

The fourth proportional to 958.74, 1,438.62 and 520.31 is: 780.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.74 : 1,438.62 = 520.31 : x
  2. Step 2: Convert to fraction form
    958.74/1,438.62 = 520.31/x
  3. Step 3: Cross multiply
    958.74x = 1,438.62 × 520.31
  4. Step 4: Simplify right side
    958.74x = 748,530.02
  5. Step 5: Solve for x
    x = 748,530.02/958.74
  6. Step 6: Final answer
    x = 780.75

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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.