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Finding the Fourth Proportional to 18,980.63, 28,470.95 and 5,129.63

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Solution

The fourth proportional to 18,980.63, 28,470.95 and 5,129.63 is: 7,694.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980.63 : 28,470.95 = 5,129.63 : x
  2. Step 2: Convert to fraction form
    18,980.63/28,470.95 = 5,129.63/x
  3. Step 3: Cross multiply
    18,980.63x = 28,470.95 × 5,129.63
  4. Step 4: Simplify right side
    18,980.63x = 146,045,271.25
  5. Step 5: Solve for x
    x = 146,045,271.25/18,980.63
  6. Step 6: Final answer
    x = 7,694.44

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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.