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Finding the Fourth Proportional to 487.19, 671.18 and 339.56

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Solution

The fourth proportional to 487.19, 671.18 and 339.56 is: 467.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.19 : 671.18 = 339.56 : x
  2. Step 2: Convert to fraction form
    487.19/671.18 = 339.56/x
  3. Step 3: Cross multiply
    487.19x = 671.18 × 339.56
  4. Step 4: Simplify right side
    487.19x = 227,900.83
  5. Step 5: Solve for x
    x = 227,900.83/487.19
  6. Step 6: Final answer
    x = 467.79

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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.