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Finding the Fourth Proportional to 398,719.02, 550,245.48 and 217,440.84

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Solution

The fourth proportional to 398,719.02, 550,245.48 and 217,440.84 is: 300,075.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,719.02 : 550,245.48 = 217,440.84 : x
  2. Step 2: Convert to fraction form
    398,719.02/550,245.48 = 217,440.84/x
  3. Step 3: Cross multiply
    398,719.02x = 550,245.48 × 217,440.84
  4. Step 4: Simplify right side
    398,719.02x = 119,645,839,377.40
  5. Step 5: Solve for x
    x = 119,645,839,377.40/398,719.02
  6. Step 6: Final answer
    x = 300,075.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.