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Finding the Fourth Proportional to 487.67, 673.65 and 394.79

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Solution

The fourth proportional to 487.67, 673.65 and 394.79 is: 545.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.67 : 673.65 = 394.79 : x
  2. Step 2: Convert to fraction form
    487.67/673.65 = 394.79/x
  3. Step 3: Cross multiply
    487.67x = 673.65 × 394.79
  4. Step 4: Simplify right side
    487.67x = 265,946.92
  5. Step 5: Solve for x
    x = 265,946.92/487.67
  6. Step 6: Final answer
    x = 545.35

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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.