Home / 20,991.78-28,968.57-11,560.34

Finding the Fourth Proportional to 20,991.78, 28,968.57 and 11,560.34

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Solution

The fourth proportional to 20,991.78, 28,968.57 and 11,560.34 is: 15,953.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.78 : 28,968.57 = 11,560.34 : x
  2. Step 2: Convert to fraction form
    20,991.78/28,968.57 = 11,560.34/x
  3. Step 3: Cross multiply
    20,991.78x = 28,968.57 × 11,560.34
  4. Step 4: Simplify right side
    20,991.78x = 334,886,518.51
  5. Step 5: Solve for x
    x = 334,886,518.51/20,991.78
  6. Step 6: Final answer
    x = 15,953.22

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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.