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Finding the Fourth Proportional to 239.78, 330.93 and 156.84

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Solution

The fourth proportional to 239.78, 330.93 and 156.84 is: 216.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.78 : 330.93 = 156.84 : x
  2. Step 2: Convert to fraction form
    239.78/330.93 = 156.84/x
  3. Step 3: Cross multiply
    239.78x = 330.93 × 156.84
  4. Step 4: Simplify right side
    239.78x = 51,903.06
  5. Step 5: Solve for x
    x = 51,903.06/239.78
  6. Step 6: Final answer
    x = 216.47

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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.