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Finding the Fourth Proportional to 801.53, 1,202.40 and 390.32

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Solution

The fourth proportional to 801.53, 1,202.40 and 390.32 is: 585.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.53 : 1,202.40 = 390.32 : x
  2. Step 2: Convert to fraction form
    801.53/1,202.40 = 390.32/x
  3. Step 3: Cross multiply
    801.53x = 1,202.40 × 390.32
  4. Step 4: Simplify right side
    801.53x = 469,318.82
  5. Step 5: Solve for x
    x = 469,318.82/801.53
  6. Step 6: Final answer
    x = 585.53

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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.