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Finding the Fourth Proportional to 568.47, 782.76 and 485.39

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Solution

The fourth proportional to 568.47, 782.76 and 485.39 is: 668.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.47 : 782.76 = 485.39 : x
  2. Step 2: Convert to fraction form
    568.47/782.76 = 485.39/x
  3. Step 3: Cross multiply
    568.47x = 782.76 × 485.39
  4. Step 4: Simplify right side
    568.47x = 379,947.65
  5. Step 5: Solve for x
    x = 379,947.65/568.47
  6. Step 6: Final answer
    x = 668.37

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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.