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Finding the Fourth Proportional to 255.57, 382.95 and 147.12

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Solution

The fourth proportional to 255.57, 382.95 and 147.12 is: 220.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.57 : 382.95 = 147.12 : x
  2. Step 2: Convert to fraction form
    255.57/382.95 = 147.12/x
  3. Step 3: Cross multiply
    255.57x = 382.95 × 147.12
  4. Step 4: Simplify right side
    255.57x = 56,339.60
  5. Step 5: Solve for x
    x = 56,339.60/255.57
  6. Step 6: Final answer
    x = 220.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.