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Finding the Fourth Proportional to 1,621.66, 2,238.16 and 992.56

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Solution

The fourth proportional to 1,621.66, 2,238.16 and 992.56 is: 1,369.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.66 : 2,238.16 = 992.56 : x
  2. Step 2: Convert to fraction form
    1,621.66/2,238.16 = 992.56/x
  3. Step 3: Cross multiply
    1,621.66x = 2,238.16 × 992.56
  4. Step 4: Simplify right side
    1,621.66x = 2,221,508.09
  5. Step 5: Solve for x
    x = 2,221,508.09/1,621.66
  6. Step 6: Final answer
    x = 1,369.90

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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.