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Finding the Fourth Proportional to 288.59, 398.65 and 257.49

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Solution

The fourth proportional to 288.59, 398.65 and 257.49 is: 355.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.59 : 398.65 = 257.49 : x
  2. Step 2: Convert to fraction form
    288.59/398.65 = 257.49/x
  3. Step 3: Cross multiply
    288.59x = 398.65 × 257.49
  4. Step 4: Simplify right side
    288.59x = 102,647.74
  5. Step 5: Solve for x
    x = 102,647.74/288.59
  6. Step 6: Final answer
    x = 355.69

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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.