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Finding the Fourth Proportional to 3,587.39, 5,380.94 and 990.26

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Solution

The fourth proportional to 3,587.39, 5,380.94 and 990.26 is: 1,485.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.39 : 5,380.94 = 990.26 : x
  2. Step 2: Convert to fraction form
    3,587.39/5,380.94 = 990.26/x
  3. Step 3: Cross multiply
    3,587.39x = 5,380.94 × 990.26
  4. Step 4: Simplify right side
    3,587.39x = 5,328,529.64
  5. Step 5: Solve for x
    x = 5,328,529.64/3,587.39
  6. Step 6: Final answer
    x = 1,485.35

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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.