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Finding the Fourth Proportional to 2,158.86, 3,238.08 and 697.21

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Solution

The fourth proportional to 2,158.86, 3,238.08 and 697.21 is: 1,045.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.86 : 3,238.08 = 697.21 : x
  2. Step 2: Convert to fraction form
    2,158.86/3,238.08 = 697.21/x
  3. Step 3: Cross multiply
    2,158.86x = 3,238.08 × 697.21
  4. Step 4: Simplify right side
    2,158.86x = 2,257,621.76
  5. Step 5: Solve for x
    x = 2,257,621.76/2,158.86
  6. Step 6: Final answer
    x = 1,045.75

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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.