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Finding the Fourth Proportional to 1,288.57, 1,778.24 and 699.11

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Solution

The fourth proportional to 1,288.57, 1,778.24 and 699.11 is: 964.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.57 : 1,778.24 = 699.11 : x
  2. Step 2: Convert to fraction form
    1,288.57/1,778.24 = 699.11/x
  3. Step 3: Cross multiply
    1,288.57x = 1,778.24 × 699.11
  4. Step 4: Simplify right side
    1,288.57x = 1,243,172.98
  5. Step 5: Solve for x
    x = 1,243,172.98/1,288.57
  6. Step 6: Final answer
    x = 964.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.