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Finding the Fourth Proportional to 1,212.44, 1,673.28 and 740.65

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Solution

The fourth proportional to 1,212.44, 1,673.28 and 740.65 is: 1,022.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.44 : 1,673.28 = 740.65 : x
  2. Step 2: Convert to fraction form
    1,212.44/1,673.28 = 740.65/x
  3. Step 3: Cross multiply
    1,212.44x = 1,673.28 × 740.65
  4. Step 4: Simplify right side
    1,212.44x = 1,239,314.83
  5. Step 5: Solve for x
    x = 1,239,314.83/1,212.44
  6. Step 6: Final answer
    x = 1,022.17

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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.