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Finding the Fourth Proportional to 1,691.40, 2,334.08 and 992.76

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Solution

The fourth proportional to 1,691.40, 2,334.08 and 992.76 is: 1,369.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.40 : 2,334.08 = 992.76 : x
  2. Step 2: Convert to fraction form
    1,691.40/2,334.08 = 992.76/x
  3. Step 3: Cross multiply
    1,691.40x = 2,334.08 × 992.76
  4. Step 4: Simplify right side
    1,691.40x = 2,317,181.26
  5. Step 5: Solve for x
    x = 2,317,181.26/1,691.40
  6. Step 6: Final answer
    x = 1,369.98

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1.5x scale

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.