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Finding the Fourth Proportional to 1,065.12, 1,469.30 and 672

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Solution

The fourth proportional to 1,065.12, 1,469.30 and 672 is: 927.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.12 : 1,469.30 = 672 : x
  2. Step 2: Convert to fraction form
    1,065.12/1,469.30 = 672/x
  3. Step 3: Cross multiply
    1,065.12x = 1,469.30 × 672
  4. Step 4: Simplify right side
    1,065.12x = 987,366.24
  5. Step 5: Solve for x
    x = 987,366.24/1,065.12
  6. Step 6: Final answer
    x = 927.00

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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.