Home / 7,719.40-11,579.10-4,220.20

Finding the Fourth Proportional to 7,719.40, 11,579.10 and 4,220.20

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Solution

The fourth proportional to 7,719.40, 11,579.10 and 4,220.20 is: 6,330.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,719.40 : 11,579.10 = 4,220.20 : x
  2. Step 2: Convert to fraction form
    7,719.40/11,579.10 = 4,220.20/x
  3. Step 3: Cross multiply
    7,719.40x = 11,579.10 × 4,220.20
  4. Step 4: Simplify right side
    7,719.40x = 48,866,117.82
  5. Step 5: Solve for x
    x = 48,866,117.82/7,719.40
  6. Step 6: Final answer
    x = 6,330.30

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Similar ratio
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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.