Home / 20,860.89-28,788.72-11,430.06

Finding the Fourth Proportional to 20,860.89, 28,788.72 and 11,430.06

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Solution

The fourth proportional to 20,860.89, 28,788.72 and 11,430.06 is: 15,773.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.89 : 28,788.72 = 11,430.06 : x
  2. Step 2: Convert to fraction form
    20,860.89/28,788.72 = 11,430.06/x
  3. Step 3: Cross multiply
    20,860.89x = 28,788.72 × 11,430.06
  4. Step 4: Simplify right side
    20,860.89x = 329,056,796.92
  5. Step 5: Solve for x
    x = 329,056,796.92/20,860.89
  6. Step 6: Final answer
    x = 15,773.86

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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.