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Finding the Fourth Proportional to 66,999.90, 100,281.15 and 52,128.30

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Solution

The fourth proportional to 66,999.90, 100,281.15 and 52,128.30 is: 78,022.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,999.90 : 100,281.15 = 52,128.30 : x
  2. Step 2: Convert to fraction form
    66,999.90/100,281.15 = 52,128.30/x
  3. Step 3: Cross multiply
    66,999.90x = 100,281.15 × 52,128.30
  4. Step 4: Simplify right side
    66,999.90x = 5,227,485,871.55
  5. Step 5: Solve for x
    x = 5,227,485,871.55/66,999.90
  6. Step 6: Final answer
    x = 78,022.29

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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.