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Finding the Fourth Proportional to 1,223.69, 1,688.67 and 699.68

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Solution

The fourth proportional to 1,223.69, 1,688.67 and 699.68 is: 965.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.69 : 1,688.67 = 699.68 : x
  2. Step 2: Convert to fraction form
    1,223.69/1,688.67 = 699.68/x
  3. Step 3: Cross multiply
    1,223.69x = 1,688.67 × 699.68
  4. Step 4: Simplify right side
    1,223.69x = 1,181,528.63
  5. Step 5: Solve for x
    x = 1,181,528.63/1,223.69
  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.