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Finding the Fourth Proportional to 1,383.30, 2,074.28 and 561.42

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Solution

The fourth proportional to 1,383.30, 2,074.28 and 561.42 is: 841.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.30 : 2,074.28 = 561.42 : x
  2. Step 2: Convert to fraction form
    1,383.30/2,074.28 = 561.42/x
  3. Step 3: Cross multiply
    1,383.30x = 2,074.28 × 561.42
  4. Step 4: Simplify right side
    1,383.30x = 1,164,539.47
  5. Step 5: Solve for x
    x = 1,164,539.47/1,383.30
  6. Step 6: Final answer
    x = 841.86

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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.