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Finding the Fourth Proportional to 715,871.76, 987,905 and 393,614.80

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Solution

The fourth proportional to 715,871.76, 987,905 and 393,614.80 is: 543,189.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,871.76 : 987,905 = 393,614.80 : x
  2. Step 2: Convert to fraction form
    715,871.76/987,905 = 393,614.80/x
  3. Step 3: Cross multiply
    715,871.76x = 987,905 × 393,614.80
  4. Step 4: Simplify right side
    715,871.76x = 388,854,028,994
  5. Step 5: Solve for x
    x = 388,854,028,994/715,871.76
  6. Step 6: Final answer
    x = 543,189.51

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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.