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Finding the Fourth Proportional to 1,240.95, 1,859.89 and 693.52

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Solution

The fourth proportional to 1,240.95, 1,859.89 and 693.52 is: 1,039.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.95 : 1,859.89 = 693.52 : x
  2. Step 2: Convert to fraction form
    1,240.95/1,859.89 = 693.52/x
  3. Step 3: Cross multiply
    1,240.95x = 1,859.89 × 693.52
  4. Step 4: Simplify right side
    1,240.95x = 1,289,867.38
  5. Step 5: Solve for x
    x = 1,289,867.38/1,240.95
  6. Step 6: Final answer
    x = 1,039.42

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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.