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Finding the Fourth Proportional to 867.38, 1,299.92 and 623.39

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Solution

The fourth proportional to 867.38, 1,299.92 and 623.39 is: 934.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.38 : 1,299.92 = 623.39 : x
  2. Step 2: Convert to fraction form
    867.38/1,299.92 = 623.39/x
  3. Step 3: Cross multiply
    867.38x = 1,299.92 × 623.39
  4. Step 4: Simplify right side
    867.38x = 810,347.51
  5. Step 5: Solve for x
    x = 810,347.51/867.38
  6. Step 6: Final answer
    x = 934.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.