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Finding the Fourth Proportional to 961.66, 1,439.80 and 521.33

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Solution

The fourth proportional to 961.66, 1,439.80 and 521.33 is: 780.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.66 : 1,439.80 = 521.33 : x
  2. Step 2: Convert to fraction form
    961.66/1,439.80 = 521.33/x
  3. Step 3: Cross multiply
    961.66x = 1,439.80 × 521.33
  4. Step 4: Simplify right side
    961.66x = 750,610.93
  5. Step 5: Solve for x
    x = 750,610.93/961.66
  6. Step 6: Final answer
    x = 780.54

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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.