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Finding the Fourth Proportional to 156.55, 215.85 and 134.68

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Solution

The fourth proportional to 156.55, 215.85 and 134.68 is: 185.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.55 : 215.85 = 134.68 : x
  2. Step 2: Convert to fraction form
    156.55/215.85 = 134.68/x
  3. Step 3: Cross multiply
    156.55x = 215.85 × 134.68
  4. Step 4: Simplify right side
    156.55x = 29,070.68
  5. Step 5: Solve for x
    x = 29,070.68/156.55
  6. Step 6: Final answer
    x = 185.70

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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.