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Finding the Fourth Proportional to 3,587.15, 5,381.04 and 990.09

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Solution

The fourth proportional to 3,587.15, 5,381.04 and 990.09 is: 1,485.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.15 : 5,381.04 = 990.09 : x
  2. Step 2: Convert to fraction form
    3,587.15/5,381.04 = 990.09/x
  3. Step 3: Cross multiply
    3,587.15x = 5,381.04 × 990.09
  4. Step 4: Simplify right side
    3,587.15x = 5,327,713.89
  5. Step 5: Solve for x
    x = 5,327,713.89/3,587.15
  6. Step 6: Final answer
    x = 1,485.22

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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.