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Finding the Fourth Proportional to 1,039.78, 1,560.65 and 693.36

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Solution

The fourth proportional to 1,039.78, 1,560.65 and 693.36 is: 1,040.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.78 : 1,560.65 = 693.36 : x
  2. Step 2: Convert to fraction form
    1,039.78/1,560.65 = 693.36/x
  3. Step 3: Cross multiply
    1,039.78x = 1,560.65 × 693.36
  4. Step 4: Simplify right side
    1,039.78x = 1,082,092.28
  5. Step 5: Solve for x
    x = 1,082,092.28/1,039.78
  6. Step 6: Final answer
    x = 1,040.69

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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.