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Finding the Fourth Proportional to 1,551.94, 2,141.43 and 992.90

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Solution

The fourth proportional to 1,551.94, 2,141.43 and 992.90 is: 1,370.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.94 : 2,141.43 = 992.90 : x
  2. Step 2: Convert to fraction form
    1,551.94/2,141.43 = 992.90/x
  3. Step 3: Cross multiply
    1,551.94x = 2,141.43 × 992.90
  4. Step 4: Simplify right side
    1,551.94x = 2,126,225.85
  5. Step 5: Solve for x
    x = 2,126,225.85/1,551.94
  6. Step 6: Final answer
    x = 1,370.04

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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.