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Finding the Fourth Proportional to 1,776.65, 2,451.80 and 990.61

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Solution

The fourth proportional to 1,776.65, 2,451.80 and 990.61 is: 1,367.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,776.65 : 2,451.80 = 990.61 : x
  2. Step 2: Convert to fraction form
    1,776.65/2,451.80 = 990.61/x
  3. Step 3: Cross multiply
    1,776.65x = 2,451.80 × 990.61
  4. Step 4: Simplify right side
    1,776.65x = 2,428,773.95
  5. Step 5: Solve for x
    x = 2,428,773.95/1,776.65
  6. Step 6: Final answer
    x = 1,367.06

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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.