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Finding the Fourth Proportional to 315.21, 471.45 and 257.82

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Solution

The fourth proportional to 315.21, 471.45 and 257.82 is: 385.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.21 : 471.45 = 257.82 : x
  2. Step 2: Convert to fraction form
    315.21/471.45 = 257.82/x
  3. Step 3: Cross multiply
    315.21x = 471.45 × 257.82
  4. Step 4: Simplify right side
    315.21x = 121,549.24
  5. Step 5: Solve for x
    x = 121,549.24/315.21
  6. Step 6: Final answer
    x = 385.61

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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.