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Finding the Fourth Proportional to 1,288.49, 1,778.10 and 699.01

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Solution

The fourth proportional to 1,288.49, 1,778.10 and 699.01 is: 964.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.49 : 1,778.10 = 699.01 : x
  2. Step 2: Convert to fraction form
    1,288.49/1,778.10 = 699.01/x
  3. Step 3: Cross multiply
    1,288.49x = 1,778.10 × 699.01
  4. Step 4: Simplify right side
    1,288.49x = 1,242,906.55
  5. Step 5: Solve for x
    x = 1,242,906.55/1,288.49
  6. Step 6: Final answer
    x = 964.63

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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.