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Finding the Fourth Proportional to 66,287.40, 99,409.49 and 21,905.88

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Solution

The fourth proportional to 66,287.40, 99,409.49 and 21,905.88 is: 32,851.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,287.40 : 99,409.49 = 21,905.88 : x
  2. Step 2: Convert to fraction form
    66,287.40/99,409.49 = 21,905.88/x
  3. Step 3: Cross multiply
    66,287.40x = 99,409.49 × 21,905.88
  4. Step 4: Simplify right side
    66,287.40x = 2,177,651,752.22
  5. Step 5: Solve for x
    x = 2,177,651,752.22/66,287.40
  6. Step 6: Final answer
    x = 32,851.67

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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.