Home / 31,104.08-42,889.76-21,015.04

Finding the Fourth Proportional to 31,104.08, 42,889.76 and 21,015.04

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Solution

The fourth proportional to 31,104.08, 42,889.76 and 21,015.04 is: 28,977.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,104.08 : 42,889.76 = 21,015.04 : x
  2. Step 2: Convert to fraction form
    31,104.08/42,889.76 = 21,015.04/x
  3. Step 3: Cross multiply
    31,104.08x = 42,889.76 × 21,015.04
  4. Step 4: Simplify right side
    31,104.08x = 901,330,021.99
  5. Step 5: Solve for x
    x = 901,330,021.99/31,104.08
  6. Step 6: Final answer
    x = 28,977.87

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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.