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Finding the Fourth Proportional to 312.93, 431.66 and 278.37

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Solution

The fourth proportional to 312.93, 431.66 and 278.37 is: 383.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.93 : 431.66 = 278.37 : x
  2. Step 2: Convert to fraction form
    312.93/431.66 = 278.37/x
  3. Step 3: Cross multiply
    312.93x = 431.66 × 278.37
  4. Step 4: Simplify right side
    312.93x = 120,161.89
  5. Step 5: Solve for x
    x = 120,161.89/312.93
  6. Step 6: Final answer
    x = 383.99

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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.