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Finding the Fourth Proportional to 288.17, 397.67 and 157.17

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Solution

The fourth proportional to 288.17, 397.67 and 157.17 is: 216.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.17 : 397.67 = 157.17 : x
  2. Step 2: Convert to fraction form
    288.17/397.67 = 157.17/x
  3. Step 3: Cross multiply
    288.17x = 397.67 × 157.17
  4. Step 4: Simplify right side
    288.17x = 62,501.01
  5. Step 5: Solve for x
    x = 62,501.01/288.17
  6. Step 6: Final answer
    x = 216.89

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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.