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Finding the Fourth Proportional to 1,383.69, 2,074.62 and 561

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Solution

The fourth proportional to 1,383.69, 2,074.62 and 561 is: 841.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.69 : 2,074.62 = 561 : x
  2. Step 2: Convert to fraction form
    1,383.69/2,074.62 = 561/x
  3. Step 3: Cross multiply
    1,383.69x = 2,074.62 × 561
  4. Step 4: Simplify right side
    1,383.69x = 1,163,861.82
  5. Step 5: Solve for x
    x = 1,163,861.82/1,383.69
  6. Step 6: Final answer
    x = 841.13

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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.