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Finding the Fourth Proportional to 920.53, 1,380.59 and 262.39

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Solution

The fourth proportional to 920.53, 1,380.59 and 262.39 is: 393.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.53 : 1,380.59 = 262.39 : x
  2. Step 2: Convert to fraction form
    920.53/1,380.59 = 262.39/x
  3. Step 3: Cross multiply
    920.53x = 1,380.59 × 262.39
  4. Step 4: Simplify right side
    920.53x = 362,253.42
  5. Step 5: Solve for x
    x = 362,253.42/920.53
  6. Step 6: Final answer
    x = 393.53

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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.