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Finding the Fourth Proportional to 1,112.81, 1,668.13 and 382.19

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Solution

The fourth proportional to 1,112.81, 1,668.13 and 382.19 is: 572.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.81 : 1,668.13 = 382.19 : x
  2. Step 2: Convert to fraction form
    1,112.81/1,668.13 = 382.19/x
  3. Step 3: Cross multiply
    1,112.81x = 1,668.13 × 382.19
  4. Step 4: Simplify right side
    1,112.81x = 637,533.31
  5. Step 5: Solve for x
    x = 637,533.31/1,112.81
  6. Step 6: Final answer
    x = 572.91

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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.