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Finding the Fourth Proportional to 21,148.92, 29,111.87 and 18,622.94

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Solution

The fourth proportional to 21,148.92, 29,111.87 and 18,622.94 is: 25,634.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,148.92 : 29,111.87 = 18,622.94 : x
  2. Step 2: Convert to fraction form
    21,148.92/29,111.87 = 18,622.94/x
  3. Step 3: Cross multiply
    21,148.92x = 29,111.87 × 18,622.94
  4. Step 4: Simplify right side
    21,148.92x = 542,148,509.30
  5. Step 5: Solve for x
    x = 542,148,509.30/21,148.92
  6. Step 6: Final answer
    x = 25,634.81

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Double scale
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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.