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Finding the Fourth Proportional to 1,188.28, 1,778.96 and 693.17

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Solution

The fourth proportional to 1,188.28, 1,778.96 and 693.17 is: 1,037.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.28 : 1,778.96 = 693.17 : x
  2. Step 2: Convert to fraction form
    1,188.28/1,778.96 = 693.17/x
  3. Step 3: Cross multiply
    1,188.28x = 1,778.96 × 693.17
  4. Step 4: Simplify right side
    1,188.28x = 1,233,118.24
  5. Step 5: Solve for x
    x = 1,233,118.24/1,188.28
  6. Step 6: Final answer
    x = 1,037.74

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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.