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Finding the Fourth Proportional to 709.92, 1,062.96 and 380.16

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Solution

The fourth proportional to 709.92, 1,062.96 and 380.16 is: 569.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.92 : 1,062.96 = 380.16 : x
  2. Step 2: Convert to fraction form
    709.92/1,062.96 = 380.16/x
  3. Step 3: Cross multiply
    709.92x = 1,062.96 × 380.16
  4. Step 4: Simplify right side
    709.92x = 404,094.87
  5. Step 5: Solve for x
    x = 404,094.87/709.92
  6. Step 6: Final answer
    x = 569.21

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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.