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Finding the Fourth Proportional to 1,338.69, 2,005.47 and 817.14

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Solution

The fourth proportional to 1,338.69, 2,005.47 and 817.14 is: 1,224.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.69 : 2,005.47 = 817.14 : x
  2. Step 2: Convert to fraction form
    1,338.69/2,005.47 = 817.14/x
  3. Step 3: Cross multiply
    1,338.69x = 2,005.47 × 817.14
  4. Step 4: Simplify right side
    1,338.69x = 1,638,749.76
  5. Step 5: Solve for x
    x = 1,638,749.76/1,338.69
  6. Step 6: Final answer
    x = 1,224.14

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1.5x scale

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.