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Finding the Fourth Proportional to 156.76, 215.85 and 138.34

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Solution

The fourth proportional to 156.76, 215.85 and 138.34 is: 190.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.76 : 215.85 = 138.34 : x
  2. Step 2: Convert to fraction form
    156.76/215.85 = 138.34/x
  3. Step 3: Cross multiply
    156.76x = 215.85 × 138.34
  4. Step 4: Simplify right side
    156.76x = 29,860.69
  5. Step 5: Solve for x
    x = 29,860.69/156.76
  6. Step 6: Final answer
    x = 190.49

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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.