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Finding the Fourth Proportional to 2,162.79, 3,245.76 and 864.63

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Solution

The fourth proportional to 2,162.79, 3,245.76 and 864.63 is: 1,297.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,162.79 : 3,245.76 = 864.63 : x
  2. Step 2: Convert to fraction form
    2,162.79/3,245.76 = 864.63/x
  3. Step 3: Cross multiply
    2,162.79x = 3,245.76 × 864.63
  4. Step 4: Simplify right side
    2,162.79x = 2,806,381.47
  5. Step 5: Solve for x
    x = 2,806,381.47/2,162.79
  6. Step 6: Final answer
    x = 1,297.57

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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.