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Finding the Fourth Proportional to 992.12, 1,487.26 and 342.71

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Solution

The fourth proportional to 992.12, 1,487.26 and 342.71 is: 513.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.12 : 1,487.26 = 342.71 : x
  2. Step 2: Convert to fraction form
    992.12/1,487.26 = 342.71/x
  3. Step 3: Cross multiply
    992.12x = 1,487.26 × 342.71
  4. Step 4: Simplify right side
    992.12x = 509,698.87
  5. Step 5: Solve for x
    x = 509,698.87/992.12
  6. Step 6: Final answer
    x = 513.75

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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.