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Finding the Fourth Proportional to 1,355.32, 2,032.82 and 381.40

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Solution

The fourth proportional to 1,355.32, 2,032.82 and 381.40 is: 572.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.32 : 2,032.82 = 381.40 : x
  2. Step 2: Convert to fraction form
    1,355.32/2,032.82 = 381.40/x
  3. Step 3: Cross multiply
    1,355.32x = 2,032.82 × 381.40
  4. Step 4: Simplify right side
    1,355.32x = 775,317.55
  5. Step 5: Solve for x
    x = 775,317.55/1,355.32
  6. Step 6: Final answer
    x = 572.05

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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.