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Finding the Fourth Proportional to 21,699.54, 29,945.93 and 12,139.11

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Solution

The fourth proportional to 21,699.54, 29,945.93 and 12,139.11 is: 16,752.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,699.54 : 29,945.93 = 12,139.11 : x
  2. Step 2: Convert to fraction form
    21,699.54/29,945.93 = 12,139.11/x
  3. Step 3: Cross multiply
    21,699.54x = 29,945.93 × 12,139.11
  4. Step 4: Simplify right side
    21,699.54x = 363,516,877.63
  5. Step 5: Solve for x
    x = 363,516,877.63/21,699.54
  6. Step 6: Final answer
    x = 16,752.28

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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.