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Finding the Fourth Proportional to 992.85, 1,489.11 and 262.47

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Solution

The fourth proportional to 992.85, 1,489.11 and 262.47 is: 393.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.85 : 1,489.11 = 262.47 : x
  2. Step 2: Convert to fraction form
    992.85/1,489.11 = 262.47/x
  3. Step 3: Cross multiply
    992.85x = 1,489.11 × 262.47
  4. Step 4: Simplify right side
    992.85x = 390,846.70
  5. Step 5: Solve for x
    x = 390,846.70/992.85
  6. Step 6: Final answer
    x = 393.66

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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.