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Finding the Fourth Proportional to 1,223.68, 1,688.64 and 699.72

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Solution

The fourth proportional to 1,223.68, 1,688.64 and 699.72 is: 965.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.68 : 1,688.64 = 699.72 : x
  2. Step 2: Convert to fraction form
    1,223.68/1,688.64 = 699.72/x
  3. Step 3: Cross multiply
    1,223.68x = 1,688.64 × 699.72
  4. Step 4: Simplify right side
    1,223.68x = 1,181,575.18
  5. Step 5: Solve for x
    x = 1,181,575.18/1,223.68
  6. Step 6: Final answer
    x = 965.59

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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.