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Finding the Fourth Proportional to 156.28, 215.76 and 123.64

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Solution

The fourth proportional to 156.28, 215.76 and 123.64 is: 170.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.28 : 215.76 = 123.64 : x
  2. Step 2: Convert to fraction form
    156.28/215.76 = 123.64/x
  3. Step 3: Cross multiply
    156.28x = 215.76 × 123.64
  4. Step 4: Simplify right side
    156.28x = 26,676.57
  5. Step 5: Solve for x
    x = 26,676.57/156.28
  6. Step 6: Final answer
    x = 170.70

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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.