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Finding the Fourth Proportional to 1,691, 2,333.67 and 992.60

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Solution

The fourth proportional to 1,691, 2,333.67 and 992.60 is: 1,369.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691 : 2,333.67 = 992.60 : x
  2. Step 2: Convert to fraction form
    1,691/2,333.67 = 992.60/x
  3. Step 3: Cross multiply
    1,691x = 2,333.67 × 992.60
  4. Step 4: Simplify right side
    1,691x = 2,316,400.84
  5. Step 5: Solve for x
    x = 2,316,400.84/1,691
  6. Step 6: Final answer
    x = 1,369.84

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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.