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Finding the Fourth Proportional to 156.48, 216.36 and 139.92

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Solution

The fourth proportional to 156.48, 216.36 and 139.92 is: 193.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.48 : 216.36 = 139.92 : x
  2. Step 2: Convert to fraction form
    156.48/216.36 = 139.92/x
  3. Step 3: Cross multiply
    156.48x = 216.36 × 139.92
  4. Step 4: Simplify right side
    156.48x = 30,273.09
  5. Step 5: Solve for x
    x = 30,273.09/156.48
  6. Step 6: Final answer
    x = 193.46

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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.