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Finding the Fourth Proportional to 28,647.45, 42,959.03 and 13,860.90

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Solution

The fourth proportional to 28,647.45, 42,959.03 and 13,860.90 is: 20,785.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,647.45 : 42,959.03 = 13,860.90 : x
  2. Step 2: Convert to fraction form
    28,647.45/42,959.03 = 13,860.90/x
  3. Step 3: Cross multiply
    28,647.45x = 42,959.03 × 13,860.90
  4. Step 4: Simplify right side
    28,647.45x = 595,450,749.62
  5. Step 5: Solve for x
    x = 595,450,749.62/28,647.45
  6. Step 6: Final answer
    x = 20,785.47

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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.