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Finding the Fourth Proportional to 1,223.42, 1,688.28 and 663.86

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Solution

The fourth proportional to 1,223.42, 1,688.28 and 663.86 is: 916.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.42 : 1,688.28 = 663.86 : x
  2. Step 2: Convert to fraction form
    1,223.42/1,688.28 = 663.86/x
  3. Step 3: Cross multiply
    1,223.42x = 1,688.28 × 663.86
  4. Step 4: Simplify right side
    1,223.42x = 1,120,781.56
  5. Step 5: Solve for x
    x = 1,120,781.56/1,223.42
  6. Step 6: Final answer
    x = 916.11

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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.