Home / 30,879.10-42,621.30-21,320.56

Finding the Fourth Proportional to 30,879.10, 42,621.30 and 21,320.56

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Solution

The fourth proportional to 30,879.10, 42,621.30 and 21,320.56 is: 29,427.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,879.10 : 42,621.30 = 21,320.56 : x
  2. Step 2: Convert to fraction form
    30,879.10/42,621.30 = 21,320.56/x
  3. Step 3: Cross multiply
    30,879.10x = 42,621.30 × 21,320.56
  4. Step 4: Simplify right side
    30,879.10x = 908,709,983.93
  5. Step 5: Solve for x
    x = 908,709,983.93/30,879.10
  6. Step 6: Final answer
    x = 29,427.99

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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.