Home / 5,638.19-7,780.79-3,120.50

Finding the Fourth Proportional to 5,638.19, 7,780.79 and 3,120.50

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Solution

The fourth proportional to 5,638.19, 7,780.79 and 3,120.50 is: 4,306.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.19 : 7,780.79 = 3,120.50 : x
  2. Step 2: Convert to fraction form
    5,638.19/7,780.79 = 3,120.50/x
  3. Step 3: Cross multiply
    5,638.19x = 7,780.79 × 3,120.50
  4. Step 4: Simplify right side
    5,638.19x = 24,279,982.45
  5. Step 5: Solve for x
    x = 24,279,982.45/5,638.19
  6. Step 6: Final answer
    x = 4,306.35

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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.