Home / 21,173.78-31,760.64-5,378.87

Finding the Fourth Proportional to 21,173.78, 31,760.64 and 5,378.87

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Solution

The fourth proportional to 21,173.78, 31,760.64 and 5,378.87 is: 8,068.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,173.78 : 31,760.64 = 5,378.87 : x
  2. Step 2: Convert to fraction form
    21,173.78/31,760.64 = 5,378.87/x
  3. Step 3: Cross multiply
    21,173.78x = 31,760.64 × 5,378.87
  4. Step 4: Simplify right side
    21,173.78x = 170,836,433.08
  5. Step 5: Solve for x
    x = 170,836,433.08/21,173.78
  6. Step 6: Final answer
    x = 8,068.30

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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.