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Finding the Fourth Proportional to 415,623.40, 621,879.90 and 275,655.40

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Solution

The fourth proportional to 415,623.40, 621,879.90 and 275,655.40 is: 412,451.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,623.40 : 621,879.90 = 275,655.40 : x
  2. Step 2: Convert to fraction form
    415,623.40/621,879.90 = 275,655.40/x
  3. Step 3: Cross multiply
    415,623.40x = 621,879.90 × 275,655.40
  4. Step 4: Simplify right side
    415,623.40x = 171,424,552,586.46
  5. Step 5: Solve for x
    x = 171,424,552,586.46/415,623.40
  6. Step 6: Final answer
    x = 412,451.64

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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.