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Finding the Fourth Proportional to 515,099.70, 772,649.55 and 215,480.70

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Solution

The fourth proportional to 515,099.70, 772,649.55 and 215,480.70 is: 323,221.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,099.70 : 772,649.55 = 215,480.70 : x
  2. Step 2: Convert to fraction form
    515,099.70/772,649.55 = 215,480.70/x
  3. Step 3: Cross multiply
    515,099.70x = 772,649.55 × 215,480.70
  4. Step 4: Simplify right side
    515,099.70x = 166,491,065,888.69
  5. Step 5: Solve for x
    x = 166,491,065,888.69/515,099.70
  6. Step 6: Final answer
    x = 323,221.05

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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.