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Finding the Fourth Proportional to 2,385.79, 3,577.64 and 979.24

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Solution

The fourth proportional to 2,385.79, 3,577.64 and 979.24 is: 1,468.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,385.79 : 3,577.64 = 979.24 : x
  2. Step 2: Convert to fraction form
    2,385.79/3,577.64 = 979.24/x
  3. Step 3: Cross multiply
    2,385.79x = 3,577.64 × 979.24
  4. Step 4: Simplify right side
    2,385.79x = 3,503,373.88
  5. Step 5: Solve for x
    x = 3,503,373.88/2,385.79
  6. Step 6: Final answer
    x = 1,468.43

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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.