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Finding the Fourth Proportional to 693.50, 1,040.72 and 520.38

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Solution

The fourth proportional to 693.50, 1,040.72 and 520.38 is: 780.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.50 : 1,040.72 = 520.38 : x
  2. Step 2: Convert to fraction form
    693.50/1,040.72 = 520.38/x
  3. Step 3: Cross multiply
    693.50x = 1,040.72 × 520.38
  4. Step 4: Simplify right side
    693.50x = 541,567.27
  5. Step 5: Solve for x
    x = 541,567.27/693.50
  6. Step 6: Final answer
    x = 780.92

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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.