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Finding the Fourth Proportional to 1,520.55, 2,098.74 and 990.75

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Solution

The fourth proportional to 1,520.55, 2,098.74 and 990.75 is: 1,367.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.55 : 2,098.74 = 990.75 : x
  2. Step 2: Convert to fraction form
    1,520.55/2,098.74 = 990.75/x
  3. Step 3: Cross multiply
    1,520.55x = 2,098.74 × 990.75
  4. Step 4: Simplify right side
    1,520.55x = 2,079,326.66
  5. Step 5: Solve for x
    x = 2,079,326.66/1,520.55
  6. Step 6: Final answer
    x = 1,367.48

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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.