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Finding the Fourth Proportional to 3,111.91, 4,667.88 and 920.68

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Solution

The fourth proportional to 3,111.91, 4,667.88 and 920.68 is: 1,381.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.91 : 4,667.88 = 920.68 : x
  2. Step 2: Convert to fraction form
    3,111.91/4,667.88 = 920.68/x
  3. Step 3: Cross multiply
    3,111.91x = 4,667.88 × 920.68
  4. Step 4: Simplify right side
    3,111.91x = 4,297,623.76
  5. Step 5: Solve for x
    x = 4,297,623.76/3,111.91
  6. Step 6: Final answer
    x = 1,381.02

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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.