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Finding the Fourth Proportional to 715,323.96, 987,147.61 and 393,054.93

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Solution

The fourth proportional to 715,323.96, 987,147.61 and 393,054.93 is: 542,416.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,323.96 : 987,147.61 = 393,054.93 : x
  2. Step 2: Convert to fraction form
    715,323.96/987,147.61 = 393,054.93/x
  3. Step 3: Cross multiply
    715,323.96x = 987,147.61 × 393,054.93
  4. Step 4: Simplify right side
    715,323.96x = 388,003,233,765.58
  5. Step 5: Solve for x
    x = 388,003,233,765.58/715,323.96
  6. Step 6: Final answer
    x = 542,416.10

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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.