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Finding the Fourth Proportional to 1,212.48, 1,817.69 and 866.43

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Solution

The fourth proportional to 1,212.48, 1,817.69 and 866.43 is: 1,298.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.48 : 1,817.69 = 866.43 : x
  2. Step 2: Convert to fraction form
    1,212.48/1,817.69 = 866.43/x
  3. Step 3: Cross multiply
    1,212.48x = 1,817.69 × 866.43
  4. Step 4: Simplify right side
    1,212.48x = 1,574,896.81
  5. Step 5: Solve for x
    x = 1,574,896.81/1,212.48
  6. Step 6: Final answer
    x = 1,298.91

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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.