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Finding the Fourth Proportional to 938.72, 1,409.13 and 549.18

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Solution

The fourth proportional to 938.72, 1,409.13 and 549.18 is: 824.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.72 : 1,409.13 = 549.18 : x
  2. Step 2: Convert to fraction form
    938.72/1,409.13 = 549.18/x
  3. Step 3: Cross multiply
    938.72x = 1,409.13 × 549.18
  4. Step 4: Simplify right side
    938.72x = 773,866.01
  5. Step 5: Solve for x
    x = 773,866.01/938.72
  6. Step 6: Final answer
    x = 824.38

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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.