Home / 20,431.51-28,194.85-11,478.79

Finding the Fourth Proportional to 20,431.51, 28,194.85 and 11,478.79

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Solution

The fourth proportional to 20,431.51, 28,194.85 and 11,478.79 is: 15,840.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.51 : 28,194.85 = 11,478.79 : x
  2. Step 2: Convert to fraction form
    20,431.51/28,194.85 = 11,478.79/x
  3. Step 3: Cross multiply
    20,431.51x = 28,194.85 × 11,478.79
  4. Step 4: Simplify right side
    20,431.51x = 323,642,762.23
  5. Step 5: Solve for x
    x = 323,642,762.23/20,431.51
  6. Step 6: Final answer
    x = 15,840.37

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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.