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Finding the Fourth Proportional to 1,563.71, 2,343.72 and 638.21

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Solution

The fourth proportional to 1,563.71, 2,343.72 and 638.21 is: 956.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.71 : 2,343.72 = 638.21 : x
  2. Step 2: Convert to fraction form
    1,563.71/2,343.72 = 638.21/x
  3. Step 3: Cross multiply
    1,563.71x = 2,343.72 × 638.21
  4. Step 4: Simplify right side
    1,563.71x = 1,495,773.82
  5. Step 5: Solve for x
    x = 1,495,773.82/1,563.71
  6. Step 6: Final answer
    x = 956.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.