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Finding the Fourth Proportional to 288.90, 398.66 and 157.91

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Solution

The fourth proportional to 288.90, 398.66 and 157.91 is: 217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.90 : 398.66 = 157.91 : x
  2. Step 2: Convert to fraction form
    288.90/398.66 = 157.91/x
  3. Step 3: Cross multiply
    288.90x = 398.66 × 157.91
  4. Step 4: Simplify right side
    288.90x = 62,952.40
  5. Step 5: Solve for x
    x = 62,952.40/288.90
  6. Step 6: Final answer
    x = 217.90

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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.