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Finding the Fourth Proportional to 1,112.39, 1,668.59 and 869.12

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Solution

The fourth proportional to 1,112.39, 1,668.59 and 869.12 is: 1,303.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.39 : 1,668.59 = 869.12 : x
  2. Step 2: Convert to fraction form
    1,112.39/1,668.59 = 869.12/x
  3. Step 3: Cross multiply
    1,112.39x = 1,668.59 × 869.12
  4. Step 4: Simplify right side
    1,112.39x = 1,450,204.94
  5. Step 5: Solve for x
    x = 1,450,204.94/1,112.39
  6. Step 6: Final answer
    x = 1,303.68

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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.