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Finding the Fourth Proportional to 1,065.77, 1,470.49 and 672.57

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Solution

The fourth proportional to 1,065.77, 1,470.49 and 672.57 is: 927.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.77 : 1,470.49 = 672.57 : x
  2. Step 2: Convert to fraction form
    1,065.77/1,470.49 = 672.57/x
  3. Step 3: Cross multiply
    1,065.77x = 1,470.49 × 672.57
  4. Step 4: Simplify right side
    1,065.77x = 989,005.78
  5. Step 5: Solve for x
    x = 989,005.78/1,065.77
  6. Step 6: Final answer
    x = 927.97

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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.