Home / 21,309.48-31,954.50-13,800.78

Finding the Fourth Proportional to 21,309.48, 31,954.50 and 13,800.78

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Solution

The fourth proportional to 21,309.48, 31,954.50 and 13,800.78 is: 20,694.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,309.48 : 31,954.50 = 13,800.78 : x
  2. Step 2: Convert to fraction form
    21,309.48/31,954.50 = 13,800.78/x
  3. Step 3: Cross multiply
    21,309.48x = 31,954.50 × 13,800.78
  4. Step 4: Simplify right side
    21,309.48x = 440,997,024.51
  5. Step 5: Solve for x
    x = 440,997,024.51/21,309.48
  6. Step 6: Final answer
    x = 20,694.87

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1.5x scale

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.