Home / 21,811.95-30,100.64-12,380.67

Finding the Fourth Proportional to 21,811.95, 30,100.64 and 12,380.67

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Solution

The fourth proportional to 21,811.95, 30,100.64 and 12,380.67 is: 17,085.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,811.95 : 30,100.64 = 12,380.67 : x
  2. Step 2: Convert to fraction form
    21,811.95/30,100.64 = 12,380.67/x
  3. Step 3: Cross multiply
    21,811.95x = 30,100.64 × 12,380.67
  4. Step 4: Simplify right side
    21,811.95x = 372,666,090.63
  5. Step 5: Solve for x
    x = 372,666,090.63/21,811.95
  6. Step 6: Final answer
    x = 17,085.41

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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.