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Finding the Fourth Proportional to 3,587.72, 5,381.88 and 990.65

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Solution

The fourth proportional to 3,587.72, 5,381.88 and 990.65 is: 1,486.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.72 : 5,381.88 = 990.65 : x
  2. Step 2: Convert to fraction form
    3,587.72/5,381.88 = 990.65/x
  3. Step 3: Cross multiply
    3,587.72x = 5,381.88 × 990.65
  4. Step 4: Simplify right side
    3,587.72x = 5,331,559.42
  5. Step 5: Solve for x
    x = 5,331,559.42/3,587.72
  6. Step 6: Final answer
    x = 1,486.06

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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.