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Finding the Fourth Proportional to 715,597.20, 987,530.28 and 393,314.79

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Solution

The fourth proportional to 715,597.20, 987,530.28 and 393,314.79 is: 542,777.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,597.20 : 987,530.28 = 393,314.79 : x
  2. Step 2: Convert to fraction form
    715,597.20/987,530.28 = 393,314.79/x
  3. Step 3: Cross multiply
    715,597.20x = 987,530.28 × 393,314.79
  4. Step 4: Simplify right side
    715,597.20x = 388,410,264,696.84
  5. Step 5: Solve for x
    x = 388,410,264,696.84/715,597.20
  6. Step 6: Final answer
    x = 542,777.79

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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.