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Finding the Fourth Proportional to 1,561.76, 2,155.21 and 863.12

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Solution

The fourth proportional to 1,561.76, 2,155.21 and 863.12 is: 1,191.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.76 : 2,155.21 = 863.12 : x
  2. Step 2: Convert to fraction form
    1,561.76/2,155.21 = 863.12/x
  3. Step 3: Cross multiply
    1,561.76x = 2,155.21 × 863.12
  4. Step 4: Simplify right side
    1,561.76x = 1,860,204.86
  5. Step 5: Solve for x
    x = 1,860,204.86/1,561.76
  6. Step 6: Final answer
    x = 1,191.10

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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.