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Finding the Fourth Proportional to 275.78, 380.59 and 151.45

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Solution

The fourth proportional to 275.78, 380.59 and 151.45 is: 209.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.78 : 380.59 = 151.45 : x
  2. Step 2: Convert to fraction form
    275.78/380.59 = 151.45/x
  3. Step 3: Cross multiply
    275.78x = 380.59 × 151.45
  4. Step 4: Simplify right side
    275.78x = 57,640.17
  5. Step 5: Solve for x
    x = 57,640.17/275.78
  6. Step 6: Final answer
    x = 209.01

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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.