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Finding the Fourth Proportional to 665,239.33, 918,031.22 and 378,759.65

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Solution

The fourth proportional to 665,239.33, 918,031.22 and 378,759.65 is: 522,688.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,239.33 : 918,031.22 = 378,759.65 : x
  2. Step 2: Convert to fraction form
    665,239.33/918,031.22 = 378,759.65/x
  3. Step 3: Cross multiply
    665,239.33x = 918,031.22 × 378,759.65
  4. Step 4: Simplify right side
    665,239.33x = 347,713,178,512.67
  5. Step 5: Solve for x
    x = 347,713,178,512.67/665,239.33
  6. Step 6: Final answer
    x = 522,688.85

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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.