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Finding the Fourth Proportional to 288.33, 397.83 and 278.45

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Solution

The fourth proportional to 288.33, 397.83 and 278.45 is: 384.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.33 : 397.83 = 278.45 : x
  2. Step 2: Convert to fraction form
    288.33/397.83 = 278.45/x
  3. Step 3: Cross multiply
    288.33x = 397.83 × 278.45
  4. Step 4: Simplify right side
    288.33x = 110,775.76
  5. Step 5: Solve for x
    x = 110,775.76/288.33
  6. Step 6: Final answer
    x = 384.20

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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.