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Finding the Fourth Proportional to 288.20, 397.71 and 157.20

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Solution

The fourth proportional to 288.20, 397.71 and 157.20 is: 216.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.20 : 397.71 = 157.20 : x
  2. Step 2: Convert to fraction form
    288.20/397.71 = 157.20/x
  3. Step 3: Cross multiply
    288.20x = 397.71 × 157.20
  4. Step 4: Simplify right side
    288.20x = 62,521.32
  5. Step 5: Solve for x
    x = 62,521.32/288.20
  6. Step 6: Final answer
    x = 216.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.