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Finding the Fourth Proportional to 499.80, 689.27 and 313.23

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Solution

The fourth proportional to 499.80, 689.27 and 313.23 is: 431.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.80 : 689.27 = 313.23 : x
  2. Step 2: Convert to fraction form
    499.80/689.27 = 313.23/x
  3. Step 3: Cross multiply
    499.80x = 689.27 × 313.23
  4. Step 4: Simplify right side
    499.80x = 215,898.48
  5. Step 5: Solve for x
    x = 215,898.48/499.80
  6. Step 6: Final answer
    x = 431.97

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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.