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Finding the Fourth Proportional to 398.16, 597.48 and 215.64

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Solution

The fourth proportional to 398.16, 597.48 and 215.64 is: 323.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.16 : 597.48 = 215.64 : x
  2. Step 2: Convert to fraction form
    398.16/597.48 = 215.64/x
  3. Step 3: Cross multiply
    398.16x = 597.48 × 215.64
  4. Step 4: Simplify right side
    398.16x = 128,840.59
  5. Step 5: Solve for x
    x = 128,840.59/398.16
  6. Step 6: Final answer
    x = 323.59

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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.