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Finding the Fourth Proportional to 487.51, 731.46 and 198.88

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Solution

The fourth proportional to 487.51, 731.46 and 198.88 is: 298.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.51 : 731.46 = 198.88 : x
  2. Step 2: Convert to fraction form
    487.51/731.46 = 198.88/x
  3. Step 3: Cross multiply
    487.51x = 731.46 × 198.88
  4. Step 4: Simplify right side
    487.51x = 145,472.76
  5. Step 5: Solve for x
    x = 145,472.76/487.51
  6. Step 6: Final answer
    x = 298.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.