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Finding the Fourth Proportional to 1,383.10, 2,074.61 and 561.35

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Solution

The fourth proportional to 1,383.10, 2,074.61 and 561.35 is: 842.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.10 : 2,074.61 = 561.35 : x
  2. Step 2: Convert to fraction form
    1,383.10/2,074.61 = 561.35/x
  3. Step 3: Cross multiply
    1,383.10x = 2,074.61 × 561.35
  4. Step 4: Simplify right side
    1,383.10x = 1,164,588.91
  5. Step 5: Solve for x
    x = 1,164,588.91/1,383.10
  6. Step 6: Final answer
    x = 842.02

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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.