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Finding the Fourth Proportional to 1,173.47, 1,618.92 and 819.29

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Solution

The fourth proportional to 1,173.47, 1,618.92 and 819.29 is: 1,130.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.47 : 1,618.92 = 819.29 : x
  2. Step 2: Convert to fraction form
    1,173.47/1,618.92 = 819.29/x
  3. Step 3: Cross multiply
    1,173.47x = 1,618.92 × 819.29
  4. Step 4: Simplify right side
    1,173.47x = 1,326,369.01
  5. Step 5: Solve for x
    x = 1,326,369.01/1,173.47
  6. Step 6: Final answer
    x = 1,130.30

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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.