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Finding the Fourth Proportional to 1,563.29, 2,157.33 and 864.66

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Solution

The fourth proportional to 1,563.29, 2,157.33 and 864.66 is: 1,193.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.29 : 2,157.33 = 864.66 : x
  2. Step 2: Convert to fraction form
    1,563.29/2,157.33 = 864.66/x
  3. Step 3: Cross multiply
    1,563.29x = 2,157.33 × 864.66
  4. Step 4: Simplify right side
    1,563.29x = 1,865,356.96
  5. Step 5: Solve for x
    x = 1,865,356.96/1,563.29
  6. Step 6: Final answer
    x = 1,193.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.