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Finding the Fourth Proportional to 18,978.76, 26,190.24 and 11,020.76

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Solution

The fourth proportional to 18,978.76, 26,190.24 and 11,020.76 is: 15,208.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.76 : 26,190.24 = 11,020.76 : x
  2. Step 2: Convert to fraction form
    18,978.76/26,190.24 = 11,020.76/x
  3. Step 3: Cross multiply
    18,978.76x = 26,190.24 × 11,020.76
  4. Step 4: Simplify right side
    18,978.76x = 288,636,349.38
  5. Step 5: Solve for x
    x = 288,636,349.38/18,978.76
  6. Step 6: Final answer
    x = 15,208.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.