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Finding the Fourth Proportional to 2,972, 4,458 and 920

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Solution

The fourth proportional to 2,972, 4,458 and 920 is: 1,380

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,972 : 4,458 = 920 : x
  2. Step 2: Convert to fraction form
    2,972/4,458 = 920/x
  3. Step 3: Cross multiply
    2,972x = 4,458 × 920
  4. Step 4: Simplify right side
    2,972x = 4,101,360
  5. Step 5: Solve for x
    x = 4,101,360/2,972
  6. Step 6: Final answer
    x = 1,380

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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.