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Finding the Fourth Proportional to 1,563.71, 2,157.90 and 865.08

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Solution

The fourth proportional to 1,563.71, 2,157.90 and 865.08 is: 1,193.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.71 : 2,157.90 = 865.08 : x
  2. Step 2: Convert to fraction form
    1,563.71/2,157.90 = 865.08/x
  3. Step 3: Cross multiply
    1,563.71x = 2,157.90 × 865.08
  4. Step 4: Simplify right side
    1,563.71x = 1,866,756.13
  5. Step 5: Solve for x
    x = 1,866,756.13/1,563.71
  6. Step 6: Final answer
    x = 1,193.80

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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.