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Finding the Fourth Proportional to 30,381.89, 41,978.39 and 21,867.17

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Solution

The fourth proportional to 30,381.89, 41,978.39 and 21,867.17 is: 30,213.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,381.89 : 41,978.39 = 21,867.17 : x
  2. Step 2: Convert to fraction form
    30,381.89/41,978.39 = 21,867.17/x
  3. Step 3: Cross multiply
    30,381.89x = 41,978.39 × 21,867.17
  4. Step 4: Simplify right side
    30,381.89x = 917,948,271.23
  5. Step 5: Solve for x
    x = 917,948,271.23/30,381.89
  6. Step 6: Final answer
    x = 30,213.67

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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.