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Finding the Fourth Proportional to 1,079.60, 1,618.74 and 531.09

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Solution

The fourth proportional to 1,079.60, 1,618.74 and 531.09 is: 796.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.60 : 1,618.74 = 531.09 : x
  2. Step 2: Convert to fraction form
    1,079.60/1,618.74 = 531.09/x
  3. Step 3: Cross multiply
    1,079.60x = 1,618.74 × 531.09
  4. Step 4: Simplify right side
    1,079.60x = 859,696.63
  5. Step 5: Solve for x
    x = 859,696.63/1,079.60
  6. Step 6: Final answer
    x = 796.31

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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.