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Finding the Fourth Proportional to 487.45, 672.56 and 298.35

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Solution

The fourth proportional to 487.45, 672.56 and 298.35 is: 411.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.45 : 672.56 = 298.35 : x
  2. Step 2: Convert to fraction form
    487.45/672.56 = 298.35/x
  3. Step 3: Cross multiply
    487.45x = 672.56 × 298.35
  4. Step 4: Simplify right side
    487.45x = 200,659.02
  5. Step 5: Solve for x
    x = 200,659.02/487.45
  6. Step 6: Final answer
    x = 411.65

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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.