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Finding the Fourth Proportional to 561.31, 774.32 and 374.90

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Solution

The fourth proportional to 561.31, 774.32 and 374.90 is: 517.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.31 : 774.32 = 374.90 : x
  2. Step 2: Convert to fraction form
    561.31/774.32 = 374.90/x
  3. Step 3: Cross multiply
    561.31x = 774.32 × 374.90
  4. Step 4: Simplify right side
    561.31x = 290,286.82
  5. Step 5: Solve for x
    x = 290,286.82/561.31
  6. Step 6: Final answer
    x = 517.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.