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Finding the Fourth Proportional to 397.61, 596.51 and 215

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Solution

The fourth proportional to 397.61, 596.51 and 215 is: 322.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.61 : 596.51 = 215 : x
  2. Step 2: Convert to fraction form
    397.61/596.51 = 215/x
  3. Step 3: Cross multiply
    397.61x = 596.51 × 215
  4. Step 4: Simplify right side
    397.61x = 128,248.58
  5. Step 5: Solve for x
    x = 128,248.58/397.61
  6. Step 6: Final answer
    x = 322.55

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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.