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Finding the Fourth Proportional to 992.32, 1,490.48 and 762.28

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Solution

The fourth proportional to 992.32, 1,490.48 and 762.28 is: 1,144.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.32 : 1,490.48 = 762.28 : x
  2. Step 2: Convert to fraction form
    992.32/1,490.48 = 762.28/x
  3. Step 3: Cross multiply
    992.32x = 1,490.48 × 762.28
  4. Step 4: Simplify right side
    992.32x = 1,136,163.09
  5. Step 5: Solve for x
    x = 1,136,163.09/992.32
  6. Step 6: Final answer
    x = 1,144.96

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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.