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Finding the Fourth Proportional to 520,185, 717,855.30 and 281,721

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Solution

The fourth proportional to 520,185, 717,855.30 and 281,721 is: 388,774.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,185 : 717,855.30 = 281,721 : x
  2. Step 2: Convert to fraction form
    520,185/717,855.30 = 281,721/x
  3. Step 3: Cross multiply
    520,185x = 717,855.30 × 281,721
  4. Step 4: Simplify right side
    520,185x = 202,234,912,971.30
  5. Step 5: Solve for x
    x = 202,234,912,971.30/520,185
  6. Step 6: Final answer
    x = 388,774.98

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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.