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Finding the Fourth Proportional to 66,976.80, 100,378.80 and 51,316.80

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Solution

The fourth proportional to 66,976.80, 100,378.80 and 51,316.80 is: 76,909.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,976.80 : 100,378.80 = 51,316.80 : x
  2. Step 2: Convert to fraction form
    66,976.80/100,378.80 = 51,316.80/x
  3. Step 3: Cross multiply
    66,976.80x = 100,378.80 × 51,316.80
  4. Step 4: Simplify right side
    66,976.80x = 5,151,118,803.84
  5. Step 5: Solve for x
    x = 5,151,118,803.84/66,976.80
  6. Step 6: Final answer
    x = 76,909.00

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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.