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Finding the Fourth Proportional to 715,520.88, 987,203.28 and 428,936.40

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Solution

The fourth proportional to 715,520.88, 987,203.28 and 428,936.40 is: 591,803.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,520.88 : 987,203.28 = 428,936.40 : x
  2. Step 2: Convert to fraction form
    715,520.88/987,203.28 = 428,936.40/x
  3. Step 3: Cross multiply
    715,520.88x = 987,203.28 × 428,936.40
  4. Step 4: Simplify right side
    715,520.88x = 423,447,420,991.39
  5. Step 5: Solve for x
    x = 423,447,420,991.39/715,520.88
  6. Step 6: Final answer
    x = 591,803.02

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.