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Finding the Fourth Proportional to 3,990.56, 5,986.50 and 1,358

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Solution

The fourth proportional to 3,990.56, 5,986.50 and 1,358 is: 2,037.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.56 : 5,986.50 = 1,358 : x
  2. Step 2: Convert to fraction form
    3,990.56/5,986.50 = 1,358/x
  3. Step 3: Cross multiply
    3,990.56x = 5,986.50 × 1,358
  4. Step 4: Simplify right side
    3,990.56x = 8,129,667
  5. Step 5: Solve for x
    x = 8,129,667/3,990.56
  6. Step 6: Final answer
    x = 2,037.22

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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.