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Finding the Fourth Proportional to 1,038.42, 1,553.58 and 663.12

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Solution

The fourth proportional to 1,038.42, 1,553.58 and 663.12 is: 992.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.42 : 1,553.58 = 663.12 : x
  2. Step 2: Convert to fraction form
    1,038.42/1,553.58 = 663.12/x
  3. Step 3: Cross multiply
    1,038.42x = 1,553.58 × 663.12
  4. Step 4: Simplify right side
    1,038.42x = 1,030,209.97
  5. Step 5: Solve for x
    x = 1,030,209.97/1,038.42
  6. Step 6: Final answer
    x = 992.09

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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.