Home / 27,991.55-38,631.06-20,905.67

Finding the Fourth Proportional to 27,991.55, 38,631.06 and 20,905.67

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Solution

The fourth proportional to 27,991.55, 38,631.06 and 20,905.67 is: 28,851.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,991.55 : 38,631.06 = 20,905.67 : x
  2. Step 2: Convert to fraction form
    27,991.55/38,631.06 = 20,905.67/x
  3. Step 3: Cross multiply
    27,991.55x = 38,631.06 × 20,905.67
  4. Step 4: Simplify right side
    27,991.55x = 807,607,998.95
  5. Step 5: Solve for x
    x = 807,607,998.95/27,991.55
  6. Step 6: Final answer
    x = 28,851.86

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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.