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Finding the Fourth Proportional to 500.36, 690.39 and 290.53

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Solution

The fourth proportional to 500.36, 690.39 and 290.53 is: 400.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.36 : 690.39 = 290.53 : x
  2. Step 2: Convert to fraction form
    500.36/690.39 = 290.53/x
  3. Step 3: Cross multiply
    500.36x = 690.39 × 290.53
  4. Step 4: Simplify right side
    500.36x = 200,579.87
  5. Step 5: Solve for x
    x = 200,579.87/500.36
  6. Step 6: Final answer
    x = 400.88

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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.