Home / 5,638.21-7,780.56-3,120.17

Finding the Fourth Proportional to 5,638.21, 7,780.56 and 3,120.17

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Solution

The fourth proportional to 5,638.21, 7,780.56 and 3,120.17 is: 4,305.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.21 : 7,780.56 = 3,120.17 : x
  2. Step 2: Convert to fraction form
    5,638.21/7,780.56 = 3,120.17/x
  3. Step 3: Cross multiply
    5,638.21x = 7,780.56 × 3,120.17
  4. Step 4: Simplify right side
    5,638.21x = 24,276,669.90
  5. Step 5: Solve for x
    x = 24,276,669.90/5,638.21
  6. Step 6: Final answer
    x = 4,305.74

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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.