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Finding the Fourth Proportional to 156.78, 216.41 and 151.65

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Solution

The fourth proportional to 156.78, 216.41 and 151.65 is: 209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.78 : 216.41 = 151.65 : x
  2. Step 2: Convert to fraction form
    156.78/216.41 = 151.65/x
  3. Step 3: Cross multiply
    156.78x = 216.41 × 151.65
  4. Step 4: Simplify right side
    156.78x = 32,817.82
  5. Step 5: Solve for x
    x = 32,817.82/156.78
  6. Step 6: Final answer
    x = 209.32

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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.