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Finding the Fourth Proportional to 644,986.79, 890,092.43 and 354,610.63

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Solution

The fourth proportional to 644,986.79, 890,092.43 and 354,610.63 is: 489,368.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,986.79 : 890,092.43 = 354,610.63 : x
  2. Step 2: Convert to fraction form
    644,986.79/890,092.43 = 354,610.63/x
  3. Step 3: Cross multiply
    644,986.79x = 890,092.43 × 354,610.63
  4. Step 4: Simplify right side
    644,986.79x = 315,636,237,360.53
  5. Step 5: Solve for x
    x = 315,636,237,360.53/644,986.79
  6. Step 6: Final answer
    x = 489,368.53

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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.