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Finding the Fourth Proportional to 1,039.62, 1,559.43 and 519.60

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Solution

The fourth proportional to 1,039.62, 1,559.43 and 519.60 is: 779.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.62 : 1,559.43 = 519.60 : x
  2. Step 2: Convert to fraction form
    1,039.62/1,559.43 = 519.60/x
  3. Step 3: Cross multiply
    1,039.62x = 1,559.43 × 519.60
  4. Step 4: Simplify right side
    1,039.62x = 810,279.83
  5. Step 5: Solve for x
    x = 810,279.83/1,039.62
  6. Step 6: Final answer
    x = 779.40

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Double scale
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1.5x scale

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.