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Finding the Fourth Proportional to 519.50, 779.08 and 172.74

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Solution

The fourth proportional to 519.50, 779.08 and 172.74 is: 259.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.50 : 779.08 = 172.74 : x
  2. Step 2: Convert to fraction form
    519.50/779.08 = 172.74/x
  3. Step 3: Cross multiply
    519.50x = 779.08 × 172.74
  4. Step 4: Simplify right side
    519.50x = 134,579.14
  5. Step 5: Solve for x
    x = 134,579.14/519.50
  6. Step 6: Final answer
    x = 259.06

Related Problems

Find fourth proportional to 259.75, 389.54 and 86.37
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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.