Home / 30,880.10-42,622.68-21,321.56

Finding the Fourth Proportional to 30,880.10, 42,622.68 and 21,321.56

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Solution

The fourth proportional to 30,880.10, 42,622.68 and 21,321.56 is: 29,429.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,880.10 : 42,622.68 = 21,321.56 : x
  2. Step 2: Convert to fraction form
    30,880.10/42,622.68 = 21,321.56/x
  3. Step 3: Cross multiply
    30,880.10x = 42,622.68 × 21,321.56
  4. Step 4: Simplify right side
    30,880.10x = 908,782,028.98
  5. Step 5: Solve for x
    x = 908,782,028.98/30,880.10
  6. Step 6: Final answer
    x = 29,429.37

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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.