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Finding the Fourth Proportional to 961.06, 1,325.70 and 665.80

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Solution

The fourth proportional to 961.06, 1,325.70 and 665.80 is: 918.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.06 : 1,325.70 = 665.80 : x
  2. Step 2: Convert to fraction form
    961.06/1,325.70 = 665.80/x
  3. Step 3: Cross multiply
    961.06x = 1,325.70 × 665.80
  4. Step 4: Simplify right side
    961.06x = 882,651.06
  5. Step 5: Solve for x
    x = 882,651.06/961.06
  6. Step 6: Final answer
    x = 918.41

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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.