Home / 5,431.24-8,129.40-4,919.72

Finding the Fourth Proportional to 5,431.24, 8,129.40 and 4,919.72

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Solution

The fourth proportional to 5,431.24, 8,129.40 and 4,919.72 is: 7,363.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,431.24 : 8,129.40 = 4,919.72 : x
  2. Step 2: Convert to fraction form
    5,431.24/8,129.40 = 4,919.72/x
  3. Step 3: Cross multiply
    5,431.24x = 8,129.40 × 4,919.72
  4. Step 4: Simplify right side
    5,431.24x = 39,994,371.77
  5. Step 5: Solve for x
    x = 39,994,371.77/5,431.24
  6. Step 6: Final answer
    x = 7,363.76

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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.