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Finding the Fourth Proportional to 801.96, 1,202.20 and 390.50

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Solution

The fourth proportional to 801.96, 1,202.20 and 390.50 is: 585.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.96 : 1,202.20 = 390.50 : x
  2. Step 2: Convert to fraction form
    801.96/1,202.20 = 390.50/x
  3. Step 3: Cross multiply
    801.96x = 1,202.20 × 390.50
  4. Step 4: Simplify right side
    801.96x = 469,459.10
  5. Step 5: Solve for x
    x = 469,459.10/801.96
  6. Step 6: Final answer
    x = 585.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.