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Finding the Fourth Proportional to 288.51, 398.15 and 157.51

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Solution

The fourth proportional to 288.51, 398.15 and 157.51 is: 217.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.51 : 398.15 = 157.51 : x
  2. Step 2: Convert to fraction form
    288.51/398.15 = 157.51/x
  3. Step 3: Cross multiply
    288.51x = 398.15 × 157.51
  4. Step 4: Simplify right side
    288.51x = 62,712.91
  5. Step 5: Solve for x
    x = 62,712.91/288.51
  6. Step 6: Final answer
    x = 217.37

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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.