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Finding the Fourth Proportional to 519.68, 779.63 and 172.98

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Solution

The fourth proportional to 519.68, 779.63 and 172.98 is: 259.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.68 : 779.63 = 172.98 : x
  2. Step 2: Convert to fraction form
    519.68/779.63 = 172.98/x
  3. Step 3: Cross multiply
    519.68x = 779.63 × 172.98
  4. Step 4: Simplify right side
    519.68x = 134,859.53
  5. Step 5: Solve for x
    x = 134,859.53/519.68
  6. Step 6: Final answer
    x = 259.50

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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.