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Finding the Fourth Proportional to 628,884, 868,436.16 and 399,515.52

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Solution

The fourth proportional to 628,884, 868,436.16 and 399,515.52 is: 551,697.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,884 : 868,436.16 = 399,515.52 : x
  2. Step 2: Convert to fraction form
    628,884/868,436.16 = 399,515.52/x
  3. Step 3: Cross multiply
    628,884x = 868,436.16 × 399,515.52
  4. Step 4: Simplify right side
    628,884x = 346,953,724,049.20
  5. Step 5: Solve for x
    x = 346,953,724,049.20/628,884
  6. Step 6: Final answer
    x = 551,697.49

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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.