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Finding the Fourth Proportional to 961.40, 1,326.88 and 568.55

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Solution

The fourth proportional to 961.40, 1,326.88 and 568.55 is: 784.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.40 : 1,326.88 = 568.55 : x
  2. Step 2: Convert to fraction form
    961.40/1,326.88 = 568.55/x
  3. Step 3: Cross multiply
    961.40x = 1,326.88 × 568.55
  4. Step 4: Simplify right side
    961.40x = 754,401.65
  5. Step 5: Solve for x
    x = 754,401.65/961.40
  6. Step 6: Final answer
    x = 784.69

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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.