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Finding the Fourth Proportional to 21,111, 29,130.66 and 11,678.28

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Solution

The fourth proportional to 21,111, 29,130.66 and 11,678.28 is: 16,114.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111 : 29,130.66 = 11,678.28 : x
  2. Step 2: Convert to fraction form
    21,111/29,130.66 = 11,678.28/x
  3. Step 3: Cross multiply
    21,111x = 29,130.66 × 11,678.28
  4. Step 4: Simplify right side
    21,111x = 340,196,004.06
  5. Step 5: Solve for x
    x = 340,196,004.06/21,111
  6. Step 6: Final answer
    x = 16,114.63

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