Home / 3,905.12-5,389.15-2,136.77

Finding the Fourth Proportional to 3,905.12, 5,389.15 and 2,136.77

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Solution

The fourth proportional to 3,905.12, 5,389.15 and 2,136.77 is: 2,948.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.12 : 5,389.15 = 2,136.77 : x
  2. Step 2: Convert to fraction form
    3,905.12/5,389.15 = 2,136.77/x
  3. Step 3: Cross multiply
    3,905.12x = 5,389.15 × 2,136.77
  4. Step 4: Simplify right side
    3,905.12x = 11,515,341.76
  5. Step 5: Solve for x
    x = 11,515,341.76/3,905.12
  6. Step 6: Final answer
    x = 2,948.78

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.