Home / 21,135.20-31,708.80-10,592.51

Finding the Fourth Proportional to 21,135.20, 31,708.80 and 10,592.51

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Solution

The fourth proportional to 21,135.20, 31,708.80 and 10,592.51 is: 15,891.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.20 : 31,708.80 = 10,592.51 : x
  2. Step 2: Convert to fraction form
    21,135.20/31,708.80 = 10,592.51/x
  3. Step 3: Cross multiply
    21,135.20x = 31,708.80 × 10,592.51
  4. Step 4: Simplify right side
    21,135.20x = 335,875,622.54
  5. Step 5: Solve for x
    x = 335,875,622.54/21,135.20
  6. Step 6: Final answer
    x = 15,891.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.