Home / 5,638.22-7,780.63-3,120.18

Finding the Fourth Proportional to 5,638.22, 7,780.63 and 3,120.18

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Solution

The fourth proportional to 5,638.22, 7,780.63 and 3,120.18 is: 4,305.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.22 : 7,780.63 = 3,120.18 : x
  2. Step 2: Convert to fraction form
    5,638.22/7,780.63 = 3,120.18/x
  3. Step 3: Cross multiply
    5,638.22x = 7,780.63 × 3,120.18
  4. Step 4: Simplify right side
    5,638.22x = 24,276,998.47
  5. Step 5: Solve for x
    x = 24,276,998.47/5,638.22
  6. Step 6: Final answer
    x = 4,305.79

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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.