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Finding the Fourth Proportional to 671,639.80, 1,008,237.30 and 405,700.60

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Solution

The fourth proportional to 671,639.80, 1,008,237.30 and 405,700.60 is: 609,020.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    671,639.80 : 1,008,237.30 = 405,700.60 : x
  2. Step 2: Convert to fraction form
    671,639.80/1,008,237.30 = 405,700.60/x
  3. Step 3: Cross multiply
    671,639.80x = 1,008,237.30 × 405,700.60
  4. Step 4: Simplify right side
    671,639.80x = 409,042,477,552.38
  5. Step 5: Solve for x
    x = 409,042,477,552.38/671,639.80
  6. Step 6: Final answer
    x = 609,020.61

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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.