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Finding the Fourth Proportional to 156.18, 215.91 and 123.42

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Solution

The fourth proportional to 156.18, 215.91 and 123.42 is: 170.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.18 : 215.91 = 123.42 : x
  2. Step 2: Convert to fraction form
    156.18/215.91 = 123.42/x
  3. Step 3: Cross multiply
    156.18x = 215.91 × 123.42
  4. Step 4: Simplify right side
    156.18x = 26,647.61
  5. Step 5: Solve for x
    x = 26,647.61/156.18
  6. Step 6: Final answer
    x = 170.62

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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.