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Finding the Fourth Proportional to 938.76, 1,409.56 and 575.08

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Solution

The fourth proportional to 938.76, 1,409.56 and 575.08 is: 863.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.76 : 1,409.56 = 575.08 : x
  2. Step 2: Convert to fraction form
    938.76/1,409.56 = 575.08/x
  3. Step 3: Cross multiply
    938.76x = 1,409.56 × 575.08
  4. Step 4: Simplify right side
    938.76x = 810,609.76
  5. Step 5: Solve for x
    x = 810,609.76/938.76
  6. Step 6: Final answer
    x = 863.49

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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.