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Finding the Fourth Proportional to 255.57, 385.43 and 247.35

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Solution

The fourth proportional to 255.57, 385.43 and 247.35 is: 373.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.57 : 385.43 = 247.35 : x
  2. Step 2: Convert to fraction form
    255.57/385.43 = 247.35/x
  3. Step 3: Cross multiply
    255.57x = 385.43 × 247.35
  4. Step 4: Simplify right side
    255.57x = 95,336.11
  5. Step 5: Solve for x
    x = 95,336.11/255.57
  6. Step 6: Final answer
    x = 373.03

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.