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Finding the Fourth Proportional to 397.80, 595.92 and 215.28

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Solution

The fourth proportional to 397.80, 595.92 and 215.28 is: 322.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.80 : 595.92 = 215.28 : x
  2. Step 2: Convert to fraction form
    397.80/595.92 = 215.28/x
  3. Step 3: Cross multiply
    397.80x = 595.92 × 215.28
  4. Step 4: Simplify right side
    397.80x = 128,289.66
  5. Step 5: Solve for x
    x = 128,289.66/397.80
  6. Step 6: Final answer
    x = 322.50

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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.