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Finding the Fourth Proportional to 992.68, 1,489.12 and 262.31

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Solution

The fourth proportional to 992.68, 1,489.12 and 262.31 is: 393.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.68 : 1,489.12 = 262.31 : x
  2. Step 2: Convert to fraction form
    992.68/1,489.12 = 262.31/x
  3. Step 3: Cross multiply
    992.68x = 1,489.12 × 262.31
  4. Step 4: Simplify right side
    992.68x = 390,611.07
  5. Step 5: Solve for x
    x = 390,611.07/992.68
  6. Step 6: Final answer
    x = 393.49

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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.