Home / 21,478.99-29,638.61-11,918.56

Finding the Fourth Proportional to 21,478.99, 29,638.61 and 11,918.56

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Solution

The fourth proportional to 21,478.99, 29,638.61 and 11,918.56 is: 16,446.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,478.99 : 29,638.61 = 11,918.56 : x
  2. Step 2: Convert to fraction form
    21,478.99/29,638.61 = 11,918.56/x
  3. Step 3: Cross multiply
    21,478.99x = 29,638.61 × 11,918.56
  4. Step 4: Simplify right side
    21,478.99x = 353,249,343.82
  5. Step 5: Solve for x
    x = 353,249,343.82/21,478.99
  6. Step 6: Final answer
    x = 16,446.28

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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.