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Finding the Fourth Proportional to 278.07, 383.75 and 153.74

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Solution

The fourth proportional to 278.07, 383.75 and 153.74 is: 212.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.07 : 383.75 = 153.74 : x
  2. Step 2: Convert to fraction form
    278.07/383.75 = 153.74/x
  3. Step 3: Cross multiply
    278.07x = 383.75 × 153.74
  4. Step 4: Simplify right side
    278.07x = 58,997.73
  5. Step 5: Solve for x
    x = 58,997.73/278.07
  6. Step 6: Final answer
    x = 212.17

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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.