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Finding the Fourth Proportional to 1,317.24, 1,815.87 and 819.63

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Solution

The fourth proportional to 1,317.24, 1,815.87 and 819.63 is: 1,129.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.24 : 1,815.87 = 819.63 : x
  2. Step 2: Convert to fraction form
    1,317.24/1,815.87 = 819.63/x
  3. Step 3: Cross multiply
    1,317.24x = 1,815.87 × 819.63
  4. Step 4: Simplify right side
    1,317.24x = 1,488,341.53
  5. Step 5: Solve for x
    x = 1,488,341.53/1,317.24
  6. Step 6: Final answer
    x = 1,129.89

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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.