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Finding the Fourth Proportional to 2,279.76, 3,420 and 981.60

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Solution

The fourth proportional to 2,279.76, 3,420 and 981.60 is: 1,472.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.76 : 3,420 = 981.60 : x
  2. Step 2: Convert to fraction form
    2,279.76/3,420 = 981.60/x
  3. Step 3: Cross multiply
    2,279.76x = 3,420 × 981.60
  4. Step 4: Simplify right side
    2,279.76x = 3,357,072
  5. Step 5: Solve for x
    x = 3,357,072/2,279.76
  6. Step 6: Final answer
    x = 1,472.56

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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.