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Finding the Fourth Proportional to 742.12, 1,021.79 and 653.54

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Solution

The fourth proportional to 742.12, 1,021.79 and 653.54 is: 899.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.12 : 1,021.79 = 653.54 : x
  2. Step 2: Convert to fraction form
    742.12/1,021.79 = 653.54/x
  3. Step 3: Cross multiply
    742.12x = 1,021.79 × 653.54
  4. Step 4: Simplify right side
    742.12x = 667,780.64
  5. Step 5: Solve for x
    x = 667,780.64/742.12
  6. Step 6: Final answer
    x = 899.83

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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.