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Finding the Fourth Proportional to 303.90, 419.25 and 210.87

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Solution

The fourth proportional to 303.90, 419.25 and 210.87 is: 290.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.90 : 419.25 = 210.87 : x
  2. Step 2: Convert to fraction form
    303.90/419.25 = 210.87/x
  3. Step 3: Cross multiply
    303.90x = 419.25 × 210.87
  4. Step 4: Simplify right side
    303.90x = 88,404.10
  5. Step 5: Solve for x
    x = 88,404.10/303.90
  6. Step 6: Final answer
    x = 290.90

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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.