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Finding the Fourth Proportional to 66,461.75, 99,705.20 and 21,495.18

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Solution

The fourth proportional to 66,461.75, 99,705.20 and 21,495.18 is: 32,246.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,461.75 : 99,705.20 = 21,495.18 : x
  2. Step 2: Convert to fraction form
    66,461.75/99,705.20 = 21,495.18/x
  3. Step 3: Cross multiply
    66,461.75x = 99,705.20 × 21,495.18
  4. Step 4: Simplify right side
    66,461.75x = 2,143,181,220.94
  5. Step 5: Solve for x
    x = 2,143,181,220.94/66,461.75
  6. Step 6: Final answer
    x = 32,246.84

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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.