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Finding the Fourth Proportional to 3,587.86, 5,382.09 and 990.79

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Solution

The fourth proportional to 3,587.86, 5,382.09 and 990.79 is: 1,486.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.86 : 5,382.09 = 990.79 : x
  2. Step 2: Convert to fraction form
    3,587.86/5,382.09 = 990.79/x
  3. Step 3: Cross multiply
    3,587.86x = 5,382.09 × 990.79
  4. Step 4: Simplify right side
    3,587.86x = 5,332,520.95
  5. Step 5: Solve for x
    x = 5,332,520.95/3,587.86
  6. Step 6: Final answer
    x = 1,486.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.