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Finding the Fourth Proportional to 498.29, 687.69 and 288.50

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Solution

The fourth proportional to 498.29, 687.69 and 288.50 is: 398.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.29 : 687.69 = 288.50 : x
  2. Step 2: Convert to fraction form
    498.29/687.69 = 288.50/x
  3. Step 3: Cross multiply
    498.29x = 687.69 × 288.50
  4. Step 4: Simplify right side
    498.29x = 198,395.13
  5. Step 5: Solve for x
    x = 198,395.13/498.29
  6. Step 6: Final answer
    x = 398.16

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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.