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Finding the Fourth Proportional to 156, 214.56 and 151.68

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Solution

The fourth proportional to 156, 214.56 and 151.68 is: 208.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    156 : 214.56 = 151.68 : x
  2. Step 2: Convert to fraction form
    156/214.56 = 151.68/x
  3. Step 3: Cross multiply
    156x = 214.56 × 151.68
  4. Step 4: Simplify right side
    156x = 32,544.46
  5. Step 5: Solve for x
    x = 32,544.46/156
  6. Step 6: Final answer
    x = 208.62

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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.