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Finding the Fourth Proportional to 548.47, 756.80 and 315.55

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Solution

The fourth proportional to 548.47, 756.80 and 315.55 is: 435.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.47 : 756.80 = 315.55 : x
  2. Step 2: Convert to fraction form
    548.47/756.80 = 315.55/x
  3. Step 3: Cross multiply
    548.47x = 756.80 × 315.55
  4. Step 4: Simplify right side
    548.47x = 238,804.46
  5. Step 5: Solve for x
    x = 238,804.46/548.47
  6. Step 6: Final answer
    x = 435.41

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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.