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Finding the Fourth Proportional to 519.40, 779.10 and 260.20

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Solution

The fourth proportional to 519.40, 779.10 and 260.20 is: 390.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.40 : 779.10 = 260.20 : x
  2. Step 2: Convert to fraction form
    519.40/779.10 = 260.20/x
  3. Step 3: Cross multiply
    519.40x = 779.10 × 260.20
  4. Step 4: Simplify right side
    519.40x = 202,721.82
  5. Step 5: Solve for x
    x = 202,721.82/519.40
  6. Step 6: Final answer
    x = 390.30

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.