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Finding the Fourth Proportional to 277.90, 416.86 and 72.46

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Solution

The fourth proportional to 277.90, 416.86 and 72.46 is: 108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.90 : 416.86 = 72.46 : x
  2. Step 2: Convert to fraction form
    277.90/416.86 = 72.46/x
  3. Step 3: Cross multiply
    277.90x = 416.86 × 72.46
  4. Step 4: Simplify right side
    277.90x = 30,207.06
  5. Step 5: Solve for x
    x = 30,207.06/277.90
  6. Step 6: Final answer
    x = 108.70

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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.