Home / 21,005.20-31,464.60-10,622.80

Finding the Fourth Proportional to 21,005.20, 31,464.60 and 10,622.80

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Solution

The fourth proportional to 21,005.20, 31,464.60 and 10,622.80 is: 15,912.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.20 : 31,464.60 = 10,622.80 : x
  2. Step 2: Convert to fraction form
    21,005.20/31,464.60 = 10,622.80/x
  3. Step 3: Cross multiply
    21,005.20x = 31,464.60 × 10,622.80
  4. Step 4: Simplify right side
    21,005.20x = 334,242,152.88
  5. Step 5: Solve for x
    x = 334,242,152.88/21,005.20
  6. Step 6: Final answer
    x = 15,912.35

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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.