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Finding the Fourth Proportional to 1,387.54, 2,079.75 and 694.78

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Solution

The fourth proportional to 1,387.54, 2,079.75 and 694.78 is: 1,041.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.54 : 2,079.75 = 694.78 : x
  2. Step 2: Convert to fraction form
    1,387.54/2,079.75 = 694.78/x
  3. Step 3: Cross multiply
    1,387.54x = 2,079.75 × 694.78
  4. Step 4: Simplify right side
    1,387.54x = 1,444,968.71
  5. Step 5: Solve for x
    x = 1,444,968.71/1,387.54
  6. Step 6: Final answer
    x = 1,041.39

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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.