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Finding the Fourth Proportional to 715,848.64, 987,871.76 and 393,564.22

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Solution

The fourth proportional to 715,848.64, 987,871.76 and 393,564.22 is: 543,118.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,848.64 : 987,871.76 = 393,564.22 : x
  2. Step 2: Convert to fraction form
    715,848.64/987,871.76 = 393,564.22/x
  3. Step 3: Cross multiply
    715,848.64x = 987,871.76 × 393,564.22
  4. Step 4: Simplify right side
    715,848.64x = 388,790,978,684.43
  5. Step 5: Solve for x
    x = 388,790,978,684.43/715,848.64
  6. Step 6: Final answer
    x = 543,118.97

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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.