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Finding the Fourth Proportional to 66,984.80, 100,390.80 and 51,324.80

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Solution

The fourth proportional to 66,984.80, 100,390.80 and 51,324.80 is: 76,921.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,984.80 : 100,390.80 = 51,324.80 : x
  2. Step 2: Convert to fraction form
    66,984.80/100,390.80 = 51,324.80/x
  3. Step 3: Cross multiply
    66,984.80x = 100,390.80 × 51,324.80
  4. Step 4: Simplify right side
    66,984.80x = 5,152,537,731.84
  5. Step 5: Solve for x
    x = 5,152,537,731.84/66,984.80
  6. Step 6: Final answer
    x = 76,921.00

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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.