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Finding the Fourth Proportional to 1,039.76, 1,559.24 and 519.59

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Solution

The fourth proportional to 1,039.76, 1,559.24 and 519.59 is: 779.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.76 : 1,559.24 = 519.59 : x
  2. Step 2: Convert to fraction form
    1,039.76/1,559.24 = 519.59/x
  3. Step 3: Cross multiply
    1,039.76x = 1,559.24 × 519.59
  4. Step 4: Simplify right side
    1,039.76x = 810,162.91
  5. Step 5: Solve for x
    x = 810,162.91/1,039.76
  6. Step 6: Final answer
    x = 779.18

Related Problems

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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.