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Finding the Fourth Proportional to 1,562.54, 2,156.12 and 863.90

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Solution

The fourth proportional to 1,562.54, 2,156.12 and 863.90 is: 1,192.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,562.54 : 2,156.12 = 863.90 : x
  2. Step 2: Convert to fraction form
    1,562.54/2,156.12 = 863.90/x
  3. Step 3: Cross multiply
    1,562.54x = 2,156.12 × 863.90
  4. Step 4: Simplify right side
    1,562.54x = 1,862,672.07
  5. Step 5: Solve for x
    x = 1,862,672.07/1,562.54
  6. Step 6: Final answer
    x = 1,192.08

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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.