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Finding the Fourth Proportional to 21,723, 29,978.01 and 12,291.36

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Solution

The fourth proportional to 21,723, 29,978.01 and 12,291.36 is: 16,962.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,723 : 29,978.01 = 12,291.36 : x
  2. Step 2: Convert to fraction form
    21,723/29,978.01 = 12,291.36/x
  3. Step 3: Cross multiply
    21,723x = 29,978.01 × 12,291.36
  4. Step 4: Simplify right side
    21,723x = 368,470,512.99
  5. Step 5: Solve for x
    x = 368,470,512.99/21,723
  6. Step 6: Final answer
    x = 16,962.23

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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.