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Finding the Fourth Proportional to 28,303.70, 42,415.31 and 20,849.54

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Solution

The fourth proportional to 28,303.70, 42,415.31 and 20,849.54 is: 31,244.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,303.70 : 42,415.31 = 20,849.54 : x
  2. Step 2: Convert to fraction form
    28,303.70/42,415.31 = 20,849.54/x
  3. Step 3: Cross multiply
    28,303.70x = 42,415.31 × 20,849.54
  4. Step 4: Simplify right side
    28,303.70x = 884,339,542.50
  5. Step 5: Solve for x
    x = 884,339,542.50/28,303.70
  6. Step 6: Final answer
    x = 31,244.67

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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.