Home / 3,989.93-5,505.21-2,478.72

Finding the Fourth Proportional to 3,989.93, 5,505.21 and 2,478.72

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Solution

The fourth proportional to 3,989.93, 5,505.21 and 2,478.72 is: 3,420.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.93 : 5,505.21 = 2,478.72 : x
  2. Step 2: Convert to fraction form
    3,989.93/5,505.21 = 2,478.72/x
  3. Step 3: Cross multiply
    3,989.93x = 5,505.21 × 2,478.72
  4. Step 4: Simplify right side
    3,989.93x = 13,645,874.13
  5. Step 5: Solve for x
    x = 13,645,874.13/3,989.93
  6. Step 6: Final answer
    x = 3,420.08

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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.