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Finding the Fourth Proportional to 1,081.95, 1,622.16 and 561.75

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Solution

The fourth proportional to 1,081.95, 1,622.16 and 561.75 is: 842.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.95 : 1,622.16 = 561.75 : x
  2. Step 2: Convert to fraction form
    1,081.95/1,622.16 = 561.75/x
  3. Step 3: Cross multiply
    1,081.95x = 1,622.16 × 561.75
  4. Step 4: Simplify right side
    1,081.95x = 911,248.38
  5. Step 5: Solve for x
    x = 911,248.38/1,081.95
  6. Step 6: Final answer
    x = 842.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.