Home / 7,715.20-11,581.44-5,123.20

Finding the Fourth Proportional to 7,715.20, 11,581.44 and 5,123.20

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Solution

The fourth proportional to 7,715.20, 11,581.44 and 5,123.20 is: 7,690.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,715.20 : 11,581.44 = 5,123.20 : x
  2. Step 2: Convert to fraction form
    7,715.20/11,581.44 = 5,123.20/x
  3. Step 3: Cross multiply
    7,715.20x = 11,581.44 × 5,123.20
  4. Step 4: Simplify right side
    7,715.20x = 59,334,033.41
  5. Step 5: Solve for x
    x = 59,334,033.41/7,715.20
  6. Step 6: Final answer
    x = 7,690.54

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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.