Home / 5,638.40-7,780.89-3,120.52

Finding the Fourth Proportional to 5,638.40, 7,780.89 and 3,120.52

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Solution

The fourth proportional to 5,638.40, 7,780.89 and 3,120.52 is: 4,306.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.40 : 7,780.89 = 3,120.52 : x
  2. Step 2: Convert to fraction form
    5,638.40/7,780.89 = 3,120.52/x
  3. Step 3: Cross multiply
    5,638.40x = 7,780.89 × 3,120.52
  4. Step 4: Simplify right side
    5,638.40x = 24,280,388.82
  5. Step 5: Solve for x
    x = 24,280,388.82/5,638.40
  6. Step 6: Final answer
    x = 4,306.25

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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.