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Finding the Fourth Proportional to 920.79, 1,381.32 and 426.96

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Solution

The fourth proportional to 920.79, 1,381.32 and 426.96 is: 640.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.79 : 1,381.32 = 426.96 : x
  2. Step 2: Convert to fraction form
    920.79/1,381.32 = 426.96/x
  3. Step 3: Cross multiply
    920.79x = 1,381.32 × 426.96
  4. Step 4: Simplify right side
    920.79x = 589,768.39
  5. Step 5: Solve for x
    x = 589,768.39/920.79
  6. Step 6: Final answer
    x = 640.50

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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.