Home / 20,969.91-31,439.60-9,870.43

Finding the Fourth Proportional to 20,969.91, 31,439.60 and 9,870.43

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Solution

The fourth proportional to 20,969.91, 31,439.60 and 9,870.43 is: 14,798.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.91 : 31,439.60 = 9,870.43 : x
  2. Step 2: Convert to fraction form
    20,969.91/31,439.60 = 9,870.43/x
  3. Step 3: Cross multiply
    20,969.91x = 31,439.60 × 9,870.43
  4. Step 4: Simplify right side
    20,969.91x = 310,322,371.03
  5. Step 5: Solve for x
    x = 310,322,371.03/20,969.91
  6. Step 6: Final answer
    x = 14,798.46

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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.