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Finding the Fourth Proportional to 920.72, 1,380.87 and 335.63

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Solution

The fourth proportional to 920.72, 1,380.87 and 335.63 is: 503.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.72 : 1,380.87 = 335.63 : x
  2. Step 2: Convert to fraction form
    920.72/1,380.87 = 335.63/x
  3. Step 3: Cross multiply
    920.72x = 1,380.87 × 335.63
  4. Step 4: Simplify right side
    920.72x = 463,454.49
  5. Step 5: Solve for x
    x = 463,454.49/920.72
  6. Step 6: Final answer
    x = 503.36

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Double scale
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1.5x scale

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.