Home / 20,908.13-28,855.04-11,478.51

Finding the Fourth Proportional to 20,908.13, 28,855.04 and 11,478.51

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Solution

The fourth proportional to 20,908.13, 28,855.04 and 11,478.51 is: 15,841.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.13 : 28,855.04 = 11,478.51 : x
  2. Step 2: Convert to fraction form
    20,908.13/28,855.04 = 11,478.51/x
  3. Step 3: Cross multiply
    20,908.13x = 28,855.04 × 11,478.51
  4. Step 4: Simplify right side
    20,908.13x = 331,212,807.80
  5. Step 5: Solve for x
    x = 331,212,807.80/20,908.13
  6. Step 6: Final answer
    x = 15,841.34

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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.