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Finding the Fourth Proportional to 1,385.09, 2,076.54 and 691.40

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Solution

The fourth proportional to 1,385.09, 2,076.54 and 691.40 is: 1,036.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.09 : 2,076.54 = 691.40 : x
  2. Step 2: Convert to fraction form
    1,385.09/2,076.54 = 691.40/x
  3. Step 3: Cross multiply
    1,385.09x = 2,076.54 × 691.40
  4. Step 4: Simplify right side
    1,385.09x = 1,435,728.19
  5. Step 5: Solve for x
    x = 1,435,728.19/1,385.09
  6. Step 6: Final answer
    x = 1,036.56

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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.