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Finding the Fourth Proportional to 858.55, 1,185.20 and 548.23

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Solution

The fourth proportional to 858.55, 1,185.20 and 548.23 is: 756.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.55 : 1,185.20 = 548.23 : x
  2. Step 2: Convert to fraction form
    858.55/1,185.20 = 548.23/x
  3. Step 3: Cross multiply
    858.55x = 1,185.20 × 548.23
  4. Step 4: Simplify right side
    858.55x = 649,758.55
  5. Step 5: Solve for x
    x = 649,758.55/858.55
  6. Step 6: Final answer
    x = 756.81

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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.