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Finding the Fourth Proportional to 3,111.90, 4,667.89 and 920.66

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Solution

The fourth proportional to 3,111.90, 4,667.89 and 920.66 is: 1,381.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.90 : 4,667.89 = 920.66 : x
  2. Step 2: Convert to fraction form
    3,111.90/4,667.89 = 920.66/x
  3. Step 3: Cross multiply
    3,111.90x = 4,667.89 × 920.66
  4. Step 4: Simplify right side
    3,111.90x = 4,297,539.61
  5. Step 5: Solve for x
    x = 4,297,539.61/3,111.90
  6. Step 6: Final answer
    x = 1,381.00

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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.