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Finding the Fourth Proportional to 277.40, 415.56 and 140.28

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Solution

The fourth proportional to 277.40, 415.56 and 140.28 is: 210.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.40 : 415.56 = 140.28 : x
  2. Step 2: Convert to fraction form
    277.40/415.56 = 140.28/x
  3. Step 3: Cross multiply
    277.40x = 415.56 × 140.28
  4. Step 4: Simplify right side
    277.40x = 58,294.76
  5. Step 5: Solve for x
    x = 58,294.76/277.40
  6. Step 6: Final answer
    x = 210.15

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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.