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Finding the Fourth Proportional to 1,561.54, 2,155 and 862.96

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Solution

The fourth proportional to 1,561.54, 2,155 and 862.96 is: 1,190.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.54 : 2,155 = 862.96 : x
  2. Step 2: Convert to fraction form
    1,561.54/2,155 = 862.96/x
  3. Step 3: Cross multiply
    1,561.54x = 2,155 × 862.96
  4. Step 4: Simplify right side
    1,561.54x = 1,859,678.80
  5. Step 5: Solve for x
    x = 1,859,678.80/1,561.54
  6. Step 6: Final answer
    x = 1,190.93

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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.