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Finding the Fourth Proportional to 1,679.92, 2,520 and 987.60

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Solution

The fourth proportional to 1,679.92, 2,520 and 987.60 is: 1,481.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.92 : 2,520 = 987.60 : x
  2. Step 2: Convert to fraction form
    1,679.92/2,520 = 987.60/x
  3. Step 3: Cross multiply
    1,679.92x = 2,520 × 987.60
  4. Step 4: Simplify right side
    1,679.92x = 2,488,752
  5. Step 5: Solve for x
    x = 2,488,752/1,679.92
  6. Step 6: Final answer
    x = 1,481.47

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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.