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Finding the Fourth Proportional to 923.12, 1,273.05 and 687.65

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Solution

The fourth proportional to 923.12, 1,273.05 and 687.65 is: 948.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.12 : 1,273.05 = 687.65 : x
  2. Step 2: Convert to fraction form
    923.12/1,273.05 = 687.65/x
  3. Step 3: Cross multiply
    923.12x = 1,273.05 × 687.65
  4. Step 4: Simplify right side
    923.12x = 875,406.47
  5. Step 5: Solve for x
    x = 875,406.47/923.12
  6. Step 6: Final answer
    x = 948.31

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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.