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Finding the Fourth Proportional to 1,385.97, 2,078.96 and 976.94

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Solution

The fourth proportional to 1,385.97, 2,078.96 and 976.94 is: 1,465.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.97 : 2,078.96 = 976.94 : x
  2. Step 2: Convert to fraction form
    1,385.97/2,078.96 = 976.94/x
  3. Step 3: Cross multiply
    1,385.97x = 2,078.96 × 976.94
  4. Step 4: Simplify right side
    1,385.97x = 2,031,003.90
  5. Step 5: Solve for x
    x = 2,031,003.90/1,385.97
  6. Step 6: Final answer
    x = 1,465.40

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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.