Home / 10,921.50-16,378.09-3,900.20

Finding the Fourth Proportional to 10,921.50, 16,378.09 and 3,900.20

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Solution

The fourth proportional to 10,921.50, 16,378.09 and 3,900.20 is: 5,848.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,921.50 : 16,378.09 = 3,900.20 : x
  2. Step 2: Convert to fraction form
    10,921.50/16,378.09 = 3,900.20/x
  3. Step 3: Cross multiply
    10,921.50x = 16,378.09 × 3,900.20
  4. Step 4: Simplify right side
    10,921.50x = 63,877,857.81
  5. Step 5: Solve for x
    x = 63,877,857.81/10,921.50
  6. Step 6: Final answer
    x = 5,848.82

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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.