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Finding the Fourth Proportional to 628,611.48, 867,647.10 and 399,279

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Solution

The fourth proportional to 628,611.48, 867,647.10 and 399,279 is: 551,108.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,611.48 : 867,647.10 = 399,279 : x
  2. Step 2: Convert to fraction form
    628,611.48/867,647.10 = 399,279/x
  3. Step 3: Cross multiply
    628,611.48x = 867,647.10 × 399,279
  4. Step 4: Simplify right side
    628,611.48x = 346,433,266,440.90
  5. Step 5: Solve for x
    x = 346,433,266,440.90/628,611.48
  6. Step 6: Final answer
    x = 551,108.72

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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.