Home / 20,820.84-28,732.80-11,389.44

Finding the Fourth Proportional to 20,820.84, 28,732.80 and 11,389.44

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Solution

The fourth proportional to 20,820.84, 28,732.80 and 11,389.44 is: 15,717.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.84 : 28,732.80 = 11,389.44 : x
  2. Step 2: Convert to fraction form
    20,820.84/28,732.80 = 11,389.44/x
  3. Step 3: Cross multiply
    20,820.84x = 28,732.80 × 11,389.44
  4. Step 4: Simplify right side
    20,820.84x = 327,250,501.63
  5. Step 5: Solve for x
    x = 327,250,501.63/20,820.84
  6. Step 6: Final answer
    x = 15,717.45

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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.