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Finding the Fourth Proportional to 920.89, 1,381.36 and 271.62

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Solution

The fourth proportional to 920.89, 1,381.36 and 271.62 is: 407.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.89 : 1,381.36 = 271.62 : x
  2. Step 2: Convert to fraction form
    920.89/1,381.36 = 271.62/x
  3. Step 3: Cross multiply
    920.89x = 1,381.36 × 271.62
  4. Step 4: Simplify right side
    920.89x = 375,204.32
  5. Step 5: Solve for x
    x = 375,204.32/920.89
  6. Step 6: Final answer
    x = 407.44

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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.