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Finding the Fourth Proportional to 156.70, 217.76 and 154.77

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Solution

The fourth proportional to 156.70, 217.76 and 154.77 is: 215.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.70 : 217.76 = 154.77 : x
  2. Step 2: Convert to fraction form
    156.70/217.76 = 154.77/x
  3. Step 3: Cross multiply
    156.70x = 217.76 × 154.77
  4. Step 4: Simplify right side
    156.70x = 33,702.72
  5. Step 5: Solve for x
    x = 33,702.72/156.70
  6. Step 6: Final answer
    x = 215.08

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.