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Finding the Fourth Proportional to 277.48, 415.95 and 115.30

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Solution

The fourth proportional to 277.48, 415.95 and 115.30 is: 172.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.48 : 415.95 = 115.30 : x
  2. Step 2: Convert to fraction form
    277.48/415.95 = 115.30/x
  3. Step 3: Cross multiply
    277.48x = 415.95 × 115.30
  4. Step 4: Simplify right side
    277.48x = 47,959.04
  5. Step 5: Solve for x
    x = 47,959.04/277.48
  6. Step 6: Final answer
    x = 172.84

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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.