Home / 31,309.20-43,228.08-21,880.80

Finding the Fourth Proportional to 31,309.20, 43,228.08 and 21,880.80

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Solution

The fourth proportional to 31,309.20, 43,228.08 and 21,880.80 is: 30,210.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,309.20 : 43,228.08 = 21,880.80 : x
  2. Step 2: Convert to fraction form
    31,309.20/43,228.08 = 21,880.80/x
  3. Step 3: Cross multiply
    31,309.20x = 43,228.08 × 21,880.80
  4. Step 4: Simplify right side
    31,309.20x = 945,864,972.86
  5. Step 5: Solve for x
    x = 945,864,972.86/31,309.20
  6. Step 6: Final answer
    x = 30,210.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.