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Finding the Fourth Proportional to 1,561.76, 2,155.36 and 863.28

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Solution

The fourth proportional to 1,561.76, 2,155.36 and 863.28 is: 1,191.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.76 : 2,155.36 = 863.28 : x
  2. Step 2: Convert to fraction form
    1,561.76/2,155.36 = 863.28/x
  3. Step 3: Cross multiply
    1,561.76x = 2,155.36 × 863.28
  4. Step 4: Simplify right side
    1,561.76x = 1,860,679.18
  5. Step 5: Solve for x
    x = 1,860,679.18/1,561.76
  6. Step 6: Final answer
    x = 1,191.40

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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.