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Finding the Fourth Proportional to 920.66, 1,380.98 and 262.59

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Solution

The fourth proportional to 920.66, 1,380.98 and 262.59 is: 393.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.66 : 1,380.98 = 262.59 : x
  2. Step 2: Convert to fraction form
    920.66/1,380.98 = 262.59/x
  3. Step 3: Cross multiply
    920.66x = 1,380.98 × 262.59
  4. Step 4: Simplify right side
    920.66x = 362,630.23
  5. Step 5: Solve for x
    x = 362,630.23/920.66
  6. Step 6: Final answer
    x = 393.88

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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.