Home / 21,765.30-30,037.40-12,810.75

Finding the Fourth Proportional to 21,765.30, 30,037.40 and 12,810.75

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Solution

The fourth proportional to 21,765.30, 30,037.40 and 12,810.75 is: 17,679.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,765.30 : 30,037.40 = 12,810.75 : x
  2. Step 2: Convert to fraction form
    21,765.30/30,037.40 = 12,810.75/x
  3. Step 3: Cross multiply
    21,765.30x = 30,037.40 × 12,810.75
  4. Step 4: Simplify right side
    21,765.30x = 384,801,622.05
  5. Step 5: Solve for x
    x = 384,801,622.05/21,765.30
  6. Step 6: Final answer
    x = 17,679.59

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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.