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Finding the Fourth Proportional to 18,947.70, 28,415.40 and 8,950.90

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Solution

The fourth proportional to 18,947.70, 28,415.40 and 8,950.90 is: 13,423.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,947.70 : 28,415.40 = 8,950.90 : x
  2. Step 2: Convert to fraction form
    18,947.70/28,415.40 = 8,950.90/x
  3. Step 3: Cross multiply
    18,947.70x = 28,415.40 × 8,950.90
  4. Step 4: Simplify right side
    18,947.70x = 254,343,403.86
  5. Step 5: Solve for x
    x = 254,343,403.86/18,947.70
  6. Step 6: Final answer
    x = 13,423.44

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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.