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Finding the Fourth Proportional to 1,223.76, 1,686.91 and 961.32

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Solution

The fourth proportional to 1,223.76, 1,686.91 and 961.32 is: 1,325.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.76 : 1,686.91 = 961.32 : x
  2. Step 2: Convert to fraction form
    1,223.76/1,686.91 = 961.32/x
  3. Step 3: Cross multiply
    1,223.76x = 1,686.91 × 961.32
  4. Step 4: Simplify right side
    1,223.76x = 1,621,660.32
  5. Step 5: Solve for x
    x = 1,621,660.32/1,223.76
  6. Step 6: Final answer
    x = 1,325.15

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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.