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Finding the Fourth Proportional to 666,438.40, 919,709.40 and 379,955.44

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Solution

The fourth proportional to 666,438.40, 919,709.40 and 379,955.44 is: 524,352.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,438.40 : 919,709.40 = 379,955.44 : x
  2. Step 2: Convert to fraction form
    666,438.40/919,709.40 = 379,955.44/x
  3. Step 3: Cross multiply
    666,438.40x = 919,709.40 × 379,955.44
  4. Step 4: Simplify right side
    666,438.40x = 349,448,589,749.14
  5. Step 5: Solve for x
    x = 349,448,589,749.14/666,438.40
  6. Step 6: Final answer
    x = 524,352.42

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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.