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Finding the Fourth Proportional to 374.45, 561.31 and 287.64

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Solution

The fourth proportional to 374.45, 561.31 and 287.64 is: 431.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.45 : 561.31 = 287.64 : x
  2. Step 2: Convert to fraction form
    374.45/561.31 = 287.64/x
  3. Step 3: Cross multiply
    374.45x = 561.31 × 287.64
  4. Step 4: Simplify right side
    374.45x = 161,454.49
  5. Step 5: Solve for x
    x = 161,454.49/374.45
  6. Step 6: Final answer
    x = 431.18

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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.