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Finding the Fourth Proportional to 156.32, 215.73 and 86.39

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Solution

The fourth proportional to 156.32, 215.73 and 86.39 is: 119.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.32 : 215.73 = 86.39 : x
  2. Step 2: Convert to fraction form
    156.32/215.73 = 86.39/x
  3. Step 3: Cross multiply
    156.32x = 215.73 × 86.39
  4. Step 4: Simplify right side
    156.32x = 18,636.91
  5. Step 5: Solve for x
    x = 18,636.91/156.32
  6. Step 6: Final answer
    x = 119.22

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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.