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Finding the Fourth Proportional to 1,065.66, 1,469.25 and 672

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Solution

The fourth proportional to 1,065.66, 1,469.25 and 672 is: 926.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.66 : 1,469.25 = 672 : x
  2. Step 2: Convert to fraction form
    1,065.66/1,469.25 = 672/x
  3. Step 3: Cross multiply
    1,065.66x = 1,469.25 × 672
  4. Step 4: Simplify right side
    1,065.66x = 987,336
  5. Step 5: Solve for x
    x = 987,336/1,065.66
  6. Step 6: Final answer
    x = 926.50

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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.