Home / 15,765.72-21,788.04-12,928.68

Finding the Fourth Proportional to 15,765.72, 21,788.04 and 12,928.68

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Solution

The fourth proportional to 15,765.72, 21,788.04 and 12,928.68 is: 17,867.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,765.72 : 21,788.04 = 12,928.68 : x
  2. Step 2: Convert to fraction form
    15,765.72/21,788.04 = 12,928.68/x
  3. Step 3: Cross multiply
    15,765.72x = 21,788.04 × 12,928.68
  4. Step 4: Simplify right side
    15,765.72x = 281,690,596.99
  5. Step 5: Solve for x
    x = 281,690,596.99/15,765.72
  6. Step 6: Final answer
    x = 17,867.28

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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.