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Finding the Fourth Proportional to 2,970, 4,455 and 918

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Solution

The fourth proportional to 2,970, 4,455 and 918 is: 1,377

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,970 : 4,455 = 918 : x
  2. Step 2: Convert to fraction form
    2,970/4,455 = 918/x
  3. Step 3: Cross multiply
    2,970x = 4,455 × 918
  4. Step 4: Simplify right side
    2,970x = 4,089,690
  5. Step 5: Solve for x
    x = 4,089,690/2,970
  6. Step 6: Final answer
    x = 1,377

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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.