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Finding the Fourth Proportional to 920.62, 1,380.96 and 335.74

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Solution

The fourth proportional to 920.62, 1,380.96 and 335.74 is: 503.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.62 : 1,380.96 = 335.74 : x
  2. Step 2: Convert to fraction form
    920.62/1,380.96 = 335.74/x
  3. Step 3: Cross multiply
    920.62x = 1,380.96 × 335.74
  4. Step 4: Simplify right side
    920.62x = 463,643.51
  5. Step 5: Solve for x
    x = 463,643.51/920.62
  6. Step 6: Final answer
    x = 503.62

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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.