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Finding the Fourth Proportional to 992.44, 1,369.14 and 619.15

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Solution

The fourth proportional to 992.44, 1,369.14 and 619.15 is: 854.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.44 : 1,369.14 = 619.15 : x
  2. Step 2: Convert to fraction form
    992.44/1,369.14 = 619.15/x
  3. Step 3: Cross multiply
    992.44x = 1,369.14 × 619.15
  4. Step 4: Simplify right side
    992.44x = 847,703.03
  5. Step 5: Solve for x
    x = 847,703.03/992.44
  6. Step 6: Final answer
    x = 854.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.