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Finding the Fourth Proportional to 288.29, 397.85 and 157.32

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Solution

The fourth proportional to 288.29, 397.85 and 157.32 is: 217.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.29 : 397.85 = 157.32 : x
  2. Step 2: Convert to fraction form
    288.29/397.85 = 157.32/x
  3. Step 3: Cross multiply
    288.29x = 397.85 × 157.32
  4. Step 4: Simplify right side
    288.29x = 62,588.98
  5. Step 5: Solve for x
    x = 62,588.98/288.29
  6. Step 6: Final answer
    x = 217.10

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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.