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Finding the Fourth Proportional to 66,980.80, 100,384.80 and 51,320.80

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Solution

The fourth proportional to 66,980.80, 100,384.80 and 51,320.80 is: 76,915.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,980.80 : 100,384.80 = 51,320.80 : x
  2. Step 2: Convert to fraction form
    66,980.80/100,384.80 = 51,320.80/x
  3. Step 3: Cross multiply
    66,980.80x = 100,384.80 × 51,320.80
  4. Step 4: Simplify right side
    66,980.80x = 5,151,828,243.84
  5. Step 5: Solve for x
    x = 5,151,828,243.84/66,980.80
  6. Step 6: Final answer
    x = 76,915.00

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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.