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Finding the Fourth Proportional to 1,317.53, 1,817.88 and 819.91

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Solution

The fourth proportional to 1,317.53, 1,817.88 and 819.91 is: 1,131.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.53 : 1,817.88 = 819.91 : x
  2. Step 2: Convert to fraction form
    1,317.53/1,817.88 = 819.91/x
  3. Step 3: Cross multiply
    1,317.53x = 1,817.88 × 819.91
  4. Step 4: Simplify right side
    1,317.53x = 1,490,491.57
  5. Step 5: Solve for x
    x = 1,490,491.57/1,317.53
  6. Step 6: Final answer
    x = 1,131.27

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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.