Home / 6,415.40-9,612.30-3,121.40

Finding the Fourth Proportional to 6,415.40, 9,612.30 and 3,121.40

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Solution

The fourth proportional to 6,415.40, 9,612.30 and 3,121.40 is: 4,676.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,415.40 : 9,612.30 = 3,121.40 : x
  2. Step 2: Convert to fraction form
    6,415.40/9,612.30 = 3,121.40/x
  3. Step 3: Cross multiply
    6,415.40x = 9,612.30 × 3,121.40
  4. Step 4: Simplify right side
    6,415.40x = 30,003,833.22
  5. Step 5: Solve for x
    x = 30,003,833.22/6,415.40
  6. Step 6: Final answer
    x = 4,676.85

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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.