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Finding the Fourth Proportional to 156.31, 215.89 and 140.02

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Solution

The fourth proportional to 156.31, 215.89 and 140.02 is: 193.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.31 : 215.89 = 140.02 : x
  2. Step 2: Convert to fraction form
    156.31/215.89 = 140.02/x
  3. Step 3: Cross multiply
    156.31x = 215.89 × 140.02
  4. Step 4: Simplify right side
    156.31x = 30,228.92
  5. Step 5: Solve for x
    x = 30,228.92/156.31
  6. Step 6: Final answer
    x = 193.39

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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.