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Finding the Fourth Proportional to 1,563.31, 2,157.38 and 855.17

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Solution

The fourth proportional to 1,563.31, 2,157.38 and 855.17 is: 1,180.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.31 : 2,157.38 = 855.17 : x
  2. Step 2: Convert to fraction form
    1,563.31/2,157.38 = 855.17/x
  3. Step 3: Cross multiply
    1,563.31x = 2,157.38 × 855.17
  4. Step 4: Simplify right side
    1,563.31x = 1,844,926.65
  5. Step 5: Solve for x
    x = 1,844,926.65/1,563.31
  6. Step 6: Final answer
    x = 1,180.14

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1.5x scale

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.