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Finding the Fourth Proportional to 3,989.86, 5,985.10 and 1,216.30

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Solution

The fourth proportional to 3,989.86, 5,985.10 and 1,216.30 is: 1,824.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.86 : 5,985.10 = 1,216.30 : x
  2. Step 2: Convert to fraction form
    3,989.86/5,985.10 = 1,216.30/x
  3. Step 3: Cross multiply
    3,989.86x = 5,985.10 × 1,216.30
  4. Step 4: Simplify right side
    3,989.86x = 7,279,677.13
  5. Step 5: Solve for x
    x = 7,279,677.13/3,989.86
  6. Step 6: Final answer
    x = 1,824.54

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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.