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Finding the Fourth Proportional to 1,112.35, 1,668.55 and 290.71

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Solution

The fourth proportional to 1,112.35, 1,668.55 and 290.71 is: 436.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.35 : 1,668.55 = 290.71 : x
  2. Step 2: Convert to fraction form
    1,112.35/1,668.55 = 290.71/x
  3. Step 3: Cross multiply
    1,112.35x = 1,668.55 × 290.71
  4. Step 4: Simplify right side
    1,112.35x = 485,064.17
  5. Step 5: Solve for x
    x = 485,064.17/1,112.35
  6. Step 6: Final answer
    x = 436.07

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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.