Home / 21,013.68-31,520.16-5,431.20

Finding the Fourth Proportional to 21,013.68, 31,520.16 and 5,431.20

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Solution

The fourth proportional to 21,013.68, 31,520.16 and 5,431.20 is: 8,146.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.68 : 31,520.16 = 5,431.20 : x
  2. Step 2: Convert to fraction form
    21,013.68/31,520.16 = 5,431.20/x
  3. Step 3: Cross multiply
    21,013.68x = 31,520.16 × 5,431.20
  4. Step 4: Simplify right side
    21,013.68x = 171,192,292.99
  5. Step 5: Solve for x
    x = 171,192,292.99/21,013.68
  6. Step 6: Final answer
    x = 8,146.71

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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.