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Finding the Fourth Proportional to 1,223.44, 1,688.34 and 663.91

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Solution

The fourth proportional to 1,223.44, 1,688.34 and 663.91 is: 916.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.44 : 1,688.34 = 663.91 : x
  2. Step 2: Convert to fraction form
    1,223.44/1,688.34 = 663.91/x
  3. Step 3: Cross multiply
    1,223.44x = 1,688.34 × 663.91
  4. Step 4: Simplify right side
    1,223.44x = 1,120,905.81
  5. Step 5: Solve for x
    x = 1,120,905.81/1,223.44
  6. Step 6: Final answer
    x = 916.19

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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.