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Finding the Fourth Proportional to 498.15, 687.38 and 288.27

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Solution

The fourth proportional to 498.15, 687.38 and 288.27 is: 397.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.15 : 687.38 = 288.27 : x
  2. Step 2: Convert to fraction form
    498.15/687.38 = 288.27/x
  3. Step 3: Cross multiply
    498.15x = 687.38 × 288.27
  4. Step 4: Simplify right side
    498.15x = 198,149.59
  5. Step 5: Solve for x
    x = 198,149.59/498.15
  6. Step 6: Final answer
    x = 397.77

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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.