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Finding the Fourth Proportional to 21,187, 29,238.39 and 12,235.28

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Solution

The fourth proportional to 21,187, 29,238.39 and 12,235.28 is: 16,884.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187 : 29,238.39 = 12,235.28 : x
  2. Step 2: Convert to fraction form
    21,187/29,238.39 = 12,235.28/x
  3. Step 3: Cross multiply
    21,187x = 29,238.39 × 12,235.28
  4. Step 4: Simplify right side
    21,187x = 357,739,888.40
  5. Step 5: Solve for x
    x = 357,739,888.40/21,187
  6. Step 6: Final answer
    x = 16,884.88

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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.