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Finding the Fourth Proportional to 66,021.80, 99,129.90 and 51,247.40

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Solution

The fourth proportional to 66,021.80, 99,129.90 and 51,247.40 is: 76,946.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,021.80 : 99,129.90 = 51,247.40 : x
  2. Step 2: Convert to fraction form
    66,021.80/99,129.90 = 51,247.40/x
  3. Step 3: Cross multiply
    66,021.80x = 99,129.90 × 51,247.40
  4. Step 4: Simplify right side
    66,021.80x = 5,080,149,637.26
  5. Step 5: Solve for x
    x = 5,080,149,637.26/66,021.80
  6. Step 6: Final answer
    x = 76,946.55

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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.