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Finding the Fourth Proportional to 28,140.21, 42,174.21 and 12,340.97

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Solution

The fourth proportional to 28,140.21, 42,174.21 and 12,340.97 is: 18,495.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,140.21 : 42,174.21 = 12,340.97 : x
  2. Step 2: Convert to fraction form
    28,140.21/42,174.21 = 12,340.97/x
  3. Step 3: Cross multiply
    28,140.21x = 42,174.21 × 12,340.97
  4. Step 4: Simplify right side
    28,140.21x = 520,470,449.51
  5. Step 5: Solve for x
    x = 520,470,449.51/28,140.21
  6. Step 6: Final answer
    x = 18,495.61

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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.