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Finding the Fourth Proportional to 628,716.08, 867,939 and 428,561.84

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Solution

The fourth proportional to 628,716.08, 867,939 and 428,561.84 is: 591,627.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,716.08 : 867,939 = 428,561.84 : x
  2. Step 2: Convert to fraction form
    628,716.08/867,939 = 428,561.84/x
  3. Step 3: Cross multiply
    628,716.08x = 867,939 × 428,561.84
  4. Step 4: Simplify right side
    628,716.08x = 371,965,534,847.76
  5. Step 5: Solve for x
    x = 371,965,534,847.76/628,716.08
  6. Step 6: Final answer
    x = 591,627.20

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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.