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Finding the Fourth Proportional to 215.61, 323.08 and 157.76

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Solution

The fourth proportional to 215.61, 323.08 and 157.76 is: 236.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.61 : 323.08 = 157.76 : x
  2. Step 2: Convert to fraction form
    215.61/323.08 = 157.76/x
  3. Step 3: Cross multiply
    215.61x = 323.08 × 157.76
  4. Step 4: Simplify right side
    215.61x = 50,969.51
  5. Step 5: Solve for x
    x = 50,969.51/215.61
  6. Step 6: Final answer
    x = 236.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.