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Finding the Fourth Proportional to 620,820.72, 855,915.48 and 405,586.80

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Solution

The fourth proportional to 620,820.72, 855,915.48 and 405,586.80 is: 559,175.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,820.72 : 855,915.48 = 405,586.80 : x
  2. Step 2: Convert to fraction form
    620,820.72/855,915.48 = 405,586.80/x
  3. Step 3: Cross multiply
    620,820.72x = 855,915.48 × 405,586.80
  4. Step 4: Simplify right side
    620,820.72x = 347,148,020,603.66
  5. Step 5: Solve for x
    x = 347,148,020,603.66/620,820.72
  6. Step 6: Final answer
    x = 559,175.96

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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.