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Finding the Fourth Proportional to 2,613.06, 3,919.59 and 665.19

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Solution

The fourth proportional to 2,613.06, 3,919.59 and 665.19 is: 997.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.06 : 3,919.59 = 665.19 : x
  2. Step 2: Convert to fraction form
    2,613.06/3,919.59 = 665.19/x
  3. Step 3: Cross multiply
    2,613.06x = 3,919.59 × 665.19
  4. Step 4: Simplify right side
    2,613.06x = 2,607,272.07
  5. Step 5: Solve for x
    x = 2,607,272.07/2,613.06
  6. Step 6: Final answer
    x = 997.79

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.