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Finding the Fourth Proportional to 19,126.80, 28,690.05 and 11,330

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Solution

The fourth proportional to 19,126.80, 28,690.05 and 11,330 is: 16,994.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,126.80 : 28,690.05 = 11,330 : x
  2. Step 2: Convert to fraction form
    19,126.80/28,690.05 = 11,330/x
  3. Step 3: Cross multiply
    19,126.80x = 28,690.05 × 11,330
  4. Step 4: Simplify right side
    19,126.80x = 325,058,266.50
  5. Step 5: Solve for x
    x = 325,058,266.50/19,126.80
  6. Step 6: Final answer
    x = 16,994.91

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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.