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Finding the Fourth Proportional to 1,223.70, 1,688.81 and 699.63

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Solution

The fourth proportional to 1,223.70, 1,688.81 and 699.63 is: 965.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.70 : 1,688.81 = 699.63 : x
  2. Step 2: Convert to fraction form
    1,223.70/1,688.81 = 699.63/x
  3. Step 3: Cross multiply
    1,223.70x = 1,688.81 × 699.63
  4. Step 4: Simplify right side
    1,223.70x = 1,181,542.14
  5. Step 5: Solve for x
    x = 1,181,542.14/1,223.70
  6. Step 6: Final answer
    x = 965.55

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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.