Home / 21,021.72-31,532.58-5,439.30

Finding the Fourth Proportional to 21,021.72, 31,532.58 and 5,439.30

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Solution

The fourth proportional to 21,021.72, 31,532.58 and 5,439.30 is: 8,158.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,021.72 : 31,532.58 = 5,439.30 : x
  2. Step 2: Convert to fraction form
    21,021.72/31,532.58 = 5,439.30/x
  3. Step 3: Cross multiply
    21,021.72x = 31,532.58 × 5,439.30
  4. Step 4: Simplify right side
    21,021.72x = 171,515,162.39
  5. Step 5: Solve for x
    x = 171,515,162.39/21,021.72
  6. Step 6: Final answer
    x = 8,158.95

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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.