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Finding the Fourth Proportional to 259.31, 357.85 and 148.78

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Solution

The fourth proportional to 259.31, 357.85 and 148.78 is: 205.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.31 : 357.85 = 148.78 : x
  2. Step 2: Convert to fraction form
    259.31/357.85 = 148.78/x
  3. Step 3: Cross multiply
    259.31x = 357.85 × 148.78
  4. Step 4: Simplify right side
    259.31x = 53,240.92
  5. Step 5: Solve for x
    x = 53,240.92/259.31
  6. Step 6: Final answer
    x = 205.32

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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.