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Finding the Fourth Proportional to 867.21, 1,297.65 and 746.91

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Solution

The fourth proportional to 867.21, 1,297.65 and 746.91 is: 1,117.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.21 : 1,297.65 = 746.91 : x
  2. Step 2: Convert to fraction form
    867.21/1,297.65 = 746.91/x
  3. Step 3: Cross multiply
    867.21x = 1,297.65 × 746.91
  4. Step 4: Simplify right side
    867.21x = 969,227.76
  5. Step 5: Solve for x
    x = 969,227.76/867.21
  6. Step 6: Final answer
    x = 1,117.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.