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Finding the Fourth Proportional to 717,897.94, 990,705.81 and 395,619.60

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Solution

The fourth proportional to 717,897.94, 990,705.81 and 395,619.60 is: 545,958.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,897.94 : 990,705.81 = 395,619.60 : x
  2. Step 2: Convert to fraction form
    717,897.94/990,705.81 = 395,619.60/x
  3. Step 3: Cross multiply
    717,897.94x = 990,705.81 × 395,619.60
  4. Step 4: Simplify right side
    717,897.94x = 391,942,636,269.88
  5. Step 5: Solve for x
    x = 391,942,636,269.88/717,897.94
  6. Step 6: Final answer
    x = 545,958.71

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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.