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Finding the Fourth Proportional to 961.88, 1,326.90 and 612.20

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Solution

The fourth proportional to 961.88, 1,326.90 and 612.20 is: 844.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.88 : 1,326.90 = 612.20 : x
  2. Step 2: Convert to fraction form
    961.88/1,326.90 = 612.20/x
  3. Step 3: Cross multiply
    961.88x = 1,326.90 × 612.20
  4. Step 4: Simplify right side
    961.88x = 812,328.18
  5. Step 5: Solve for x
    x = 812,328.18/961.88
  6. Step 6: Final answer
    x = 844.52

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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.