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Finding the Fourth Proportional to 21,898.90, 30,203.82 and 18,879.22

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Solution

The fourth proportional to 21,898.90, 30,203.82 and 18,879.22 is: 26,038.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,898.90 : 30,203.82 = 18,879.22 : x
  2. Step 2: Convert to fraction form
    21,898.90/30,203.82 = 18,879.22/x
  3. Step 3: Cross multiply
    21,898.90x = 30,203.82 × 18,879.22
  4. Step 4: Simplify right side
    21,898.90x = 570,224,562.62
  5. Step 5: Solve for x
    x = 570,224,562.62/21,898.90
  6. Step 6: Final answer
    x = 26,038.96

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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.