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Finding the Fourth Proportional to 156.48, 215.97 and 109.86

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Solution

The fourth proportional to 156.48, 215.97 and 109.86 is: 151.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.48 : 215.97 = 109.86 : x
  2. Step 2: Convert to fraction form
    156.48/215.97 = 109.86/x
  3. Step 3: Cross multiply
    156.48x = 215.97 × 109.86
  4. Step 4: Simplify right side
    156.48x = 23,726.46
  5. Step 5: Solve for x
    x = 23,726.46/156.48
  6. Step 6: Final answer
    x = 151.63

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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.