Home / 20,708.10-28,579.82-15,417.99

Finding the Fourth Proportional to 20,708.10, 28,579.82 and 15,417.99

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Solution

The fourth proportional to 20,708.10, 28,579.82 and 15,417.99 is: 21,278.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,708.10 : 28,579.82 = 15,417.99 : x
  2. Step 2: Convert to fraction form
    20,708.10/28,579.82 = 15,417.99/x
  3. Step 3: Cross multiply
    20,708.10x = 28,579.82 × 15,417.99
  4. Step 4: Simplify right side
    20,708.10x = 440,643,301.87
  5. Step 5: Solve for x
    x = 440,643,301.87/20,708.10
  6. Step 6: Final answer
    x = 21,278.79

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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.