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Finding the Fourth Proportional to 351.74, 484.80 and 289.10

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Solution

The fourth proportional to 351.74, 484.80 and 289.10 is: 398.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.74 : 484.80 = 289.10 : x
  2. Step 2: Convert to fraction form
    351.74/484.80 = 289.10/x
  3. Step 3: Cross multiply
    351.74x = 484.80 × 289.10
  4. Step 4: Simplify right side
    351.74x = 140,155.68
  5. Step 5: Solve for x
    x = 140,155.68/351.74
  6. Step 6: Final answer
    x = 398.46

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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.