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Finding the Fourth Proportional to 156.41, 215.86 and 101.28

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Solution

The fourth proportional to 156.41, 215.86 and 101.28 is: 139.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.41 : 215.86 = 101.28 : x
  2. Step 2: Convert to fraction form
    156.41/215.86 = 101.28/x
  3. Step 3: Cross multiply
    156.41x = 215.86 × 101.28
  4. Step 4: Simplify right side
    156.41x = 21,862.05
  5. Step 5: Solve for x
    x = 21,862.05/156.41
  6. Step 6: Final answer
    x = 139.77

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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.