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Finding the Fourth Proportional to 961.47, 1,328.00 and 836.73

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Solution

The fourth proportional to 961.47, 1,328.00 and 836.73 is: 1,155.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.47 : 1,328.00 = 836.73 : x
  2. Step 2: Convert to fraction form
    961.47/1,328.00 = 836.73/x
  3. Step 3: Cross multiply
    961.47x = 1,328.00 × 836.73
  4. Step 4: Simplify right side
    961.47x = 1,111,173.26
  5. Step 5: Solve for x
    x = 1,111,173.26/961.47
  6. Step 6: Final answer
    x = 1,155.70

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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.