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Finding the Fourth Proportional to 992.69, 1,489.10 and 415.56

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Solution

The fourth proportional to 992.69, 1,489.10 and 415.56 is: 623.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.69 : 1,489.10 = 415.56 : x
  2. Step 2: Convert to fraction form
    992.69/1,489.10 = 415.56/x
  3. Step 3: Cross multiply
    992.69x = 1,489.10 × 415.56
  4. Step 4: Simplify right side
    992.69x = 618,810.40
  5. Step 5: Solve for x
    x = 618,810.40/992.69
  6. Step 6: Final answer
    x = 623.37

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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.