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Finding the Fourth Proportional to 1,561.63, 2,155.05 and 863

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Solution

The fourth proportional to 1,561.63, 2,155.05 and 863 is: 1,190.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.63 : 2,155.05 = 863 : x
  2. Step 2: Convert to fraction form
    1,561.63/2,155.05 = 863/x
  3. Step 3: Cross multiply
    1,561.63x = 2,155.05 × 863
  4. Step 4: Simplify right side
    1,561.63x = 1,859,803.84
  5. Step 5: Solve for x
    x = 1,859,803.84/1,561.63
  6. Step 6: Final answer
    x = 1,190.94

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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.