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Finding the Fourth Proportional to 18,860.79, 28,291.19 and 4,820.85

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Solution

The fourth proportional to 18,860.79, 28,291.19 and 4,820.85 is: 7,231.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,860.79 : 28,291.19 = 4,820.85 : x
  2. Step 2: Convert to fraction form
    18,860.79/28,291.19 = 4,820.85/x
  3. Step 3: Cross multiply
    18,860.79x = 28,291.19 × 4,820.85
  4. Step 4: Simplify right side
    18,860.79x = 136,387,559.21
  5. Step 5: Solve for x
    x = 136,387,559.21/18,860.79
  6. Step 6: Final answer
    x = 7,231.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.