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Finding the Fourth Proportional to 511.36, 705.64 and 278.48

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Solution

The fourth proportional to 511.36, 705.64 and 278.48 is: 384.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.36 : 705.64 = 278.48 : x
  2. Step 2: Convert to fraction form
    511.36/705.64 = 278.48/x
  3. Step 3: Cross multiply
    511.36x = 705.64 × 278.48
  4. Step 4: Simplify right side
    511.36x = 196,506.63
  5. Step 5: Solve for x
    x = 196,506.63/511.36
  6. Step 6: Final answer
    x = 384.28

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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.