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Finding the Fourth Proportional to 18,693.70, 28,046.63 and 12,478.98

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Solution

The fourth proportional to 18,693.70, 28,046.63 and 12,478.98 is: 18,722.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,693.70 : 28,046.63 = 12,478.98 : x
  2. Step 2: Convert to fraction form
    18,693.70/28,046.63 = 12,478.98/x
  3. Step 3: Cross multiply
    18,693.70x = 28,046.63 × 12,478.98
  4. Step 4: Simplify right side
    18,693.70x = 349,993,132.21
  5. Step 5: Solve for x
    x = 349,993,132.21/18,693.70
  6. Step 6: Final answer
    x = 18,722.52

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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.