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Finding the Fourth Proportional to 1,776.68, 2,451.90 and 990.78

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Solution

The fourth proportional to 1,776.68, 2,451.90 and 990.78 is: 1,367.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,776.68 : 2,451.90 = 990.78 : x
  2. Step 2: Convert to fraction form
    1,776.68/2,451.90 = 990.78/x
  3. Step 3: Cross multiply
    1,776.68x = 2,451.90 × 990.78
  4. Step 4: Simplify right side
    1,776.68x = 2,429,293.48
  5. Step 5: Solve for x
    x = 2,429,293.48/1,776.68
  6. Step 6: Final answer
    x = 1,367.33

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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.