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Finding the Fourth Proportional to 498.87, 688.55 and 289.08

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Solution

The fourth proportional to 498.87, 688.55 and 289.08 is: 398.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.87 : 688.55 = 289.08 : x
  2. Step 2: Convert to fraction form
    498.87/688.55 = 289.08/x
  3. Step 3: Cross multiply
    498.87x = 688.55 × 289.08
  4. Step 4: Simplify right side
    498.87x = 199,044.59
  5. Step 5: Solve for x
    x = 199,044.59/498.87
  6. Step 6: Final answer
    x = 398.99

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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.