Home / 21,278.45-31,917.65-21,247.67

Finding the Fourth Proportional to 21,278.45, 31,917.65 and 21,247.67

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Solution

The fourth proportional to 21,278.45, 31,917.65 and 21,247.67 is: 31,871.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.45 : 31,917.65 = 21,247.67 : x
  2. Step 2: Convert to fraction form
    21,278.45/31,917.65 = 21,247.67/x
  3. Step 3: Cross multiply
    21,278.45x = 31,917.65 × 21,247.67
  4. Step 4: Simplify right side
    21,278.45x = 678,175,667.93
  5. Step 5: Solve for x
    x = 678,175,667.93/21,278.45
  6. Step 6: Final answer
    x = 31,871.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.