Home / 21,765.72-30,045.05-12,813.60

Finding the Fourth Proportional to 21,765.72, 30,045.05 and 12,813.60

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Solution

The fourth proportional to 21,765.72, 30,045.05 and 12,813.60 is: 17,687.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,765.72 : 30,045.05 = 12,813.60 : x
  2. Step 2: Convert to fraction form
    21,765.72/30,045.05 = 12,813.60/x
  3. Step 3: Cross multiply
    21,765.72x = 30,045.05 × 12,813.60
  4. Step 4: Simplify right side
    21,765.72x = 384,985,252.68
  5. Step 5: Solve for x
    x = 384,985,252.68/21,765.72
  6. Step 6: Final answer
    x = 17,687.69

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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.