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Finding the Fourth Proportional to 1,563.31, 2,157.33 and 855.18

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Solution

The fourth proportional to 1,563.31, 2,157.33 and 855.18 is: 1,180.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.31 : 2,157.33 = 855.18 : x
  2. Step 2: Convert to fraction form
    1,563.31/2,157.33 = 855.18/x
  3. Step 3: Cross multiply
    1,563.31x = 2,157.33 × 855.18
  4. Step 4: Simplify right side
    1,563.31x = 1,844,905.47
  5. Step 5: Solve for x
    x = 1,844,905.47/1,563.31
  6. Step 6: Final answer
    x = 1,180.13

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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.