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Finding the Fourth Proportional to 18,930.58, 28,395.87 and 11,990.50

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Solution

The fourth proportional to 18,930.58, 28,395.87 and 11,990.50 is: 17,985.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,930.58 : 28,395.87 = 11,990.50 : x
  2. Step 2: Convert to fraction form
    18,930.58/28,395.87 = 11,990.50/x
  3. Step 3: Cross multiply
    18,930.58x = 28,395.87 × 11,990.50
  4. Step 4: Simplify right side
    18,930.58x = 340,480,679.24
  5. Step 5: Solve for x
    x = 340,480,679.24/18,930.58
  6. Step 6: Final answer
    x = 17,985.75

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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.