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Finding the Fourth Proportional to 1,317.92, 1,817.78 and 869.27

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Solution

The fourth proportional to 1,317.92, 1,817.78 and 869.27 is: 1,198.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.92 : 1,817.78 = 869.27 : x
  2. Step 2: Convert to fraction form
    1,317.92/1,817.78 = 869.27/x
  3. Step 3: Cross multiply
    1,317.92x = 1,817.78 × 869.27
  4. Step 4: Simplify right side
    1,317.92x = 1,580,128.19
  5. Step 5: Solve for x
    x = 1,580,128.19/1,317.92
  6. Step 6: Final answer
    x = 1,198.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.