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Finding the Fourth Proportional to 2,148.48, 3,220.96 and 979

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Solution

The fourth proportional to 2,148.48, 3,220.96 and 979 is: 1,467.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,148.48 : 3,220.96 = 979 : x
  2. Step 2: Convert to fraction form
    2,148.48/3,220.96 = 979/x
  3. Step 3: Cross multiply
    2,148.48x = 3,220.96 × 979
  4. Step 4: Simplify right side
    2,148.48x = 3,153,319.84
  5. Step 5: Solve for x
    x = 3,153,319.84/2,148.48
  6. Step 6: Final answer
    x = 1,467.70

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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.