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Finding the Fourth Proportional to 938.09, 1,405.69 and 360.65

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Solution

The fourth proportional to 938.09, 1,405.69 and 360.65 is: 540.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.09 : 1,405.69 = 360.65 : x
  2. Step 2: Convert to fraction form
    938.09/1,405.69 = 360.65/x
  3. Step 3: Cross multiply
    938.09x = 1,405.69 × 360.65
  4. Step 4: Simplify right side
    938.09x = 506,954.17
  5. Step 5: Solve for x
    x = 506,954.17/938.09
  6. Step 6: Final answer
    x = 540.41

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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.