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Finding the Fourth Proportional to 239.31, 358.93 and 77.10

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Solution

The fourth proportional to 239.31, 358.93 and 77.10 is: 115.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.31 : 358.93 = 77.10 : x
  2. Step 2: Convert to fraction form
    239.31/358.93 = 77.10/x
  3. Step 3: Cross multiply
    239.31x = 358.93 × 77.10
  4. Step 4: Simplify right side
    239.31x = 27,673.50
  5. Step 5: Solve for x
    x = 27,673.50/239.31
  6. Step 6: Final answer
    x = 115.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.