Home / 21,330.99-29,431.76-12,945.87

Finding the Fourth Proportional to 21,330.99, 29,431.76 and 12,945.87

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Solution

The fourth proportional to 21,330.99, 29,431.76 and 12,945.87 is: 17,862.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,330.99 : 29,431.76 = 12,945.87 : x
  2. Step 2: Convert to fraction form
    21,330.99/29,431.76 = 12,945.87/x
  3. Step 3: Cross multiply
    21,330.99x = 29,431.76 × 12,945.87
  4. Step 4: Simplify right side
    21,330.99x = 381,019,674.10
  5. Step 5: Solve for x
    x = 381,019,674.10/21,330.99
  6. Step 6: Final answer
    x = 17,862.26

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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.