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Finding the Fourth Proportional to 552.63, 761.79 and 386.40

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Solution

The fourth proportional to 552.63, 761.79 and 386.40 is: 532.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.63 : 761.79 = 386.40 : x
  2. Step 2: Convert to fraction form
    552.63/761.79 = 386.40/x
  3. Step 3: Cross multiply
    552.63x = 761.79 × 386.40
  4. Step 4: Simplify right side
    552.63x = 294,355.66
  5. Step 5: Solve for x
    x = 294,355.66/552.63
  6. Step 6: Final answer
    x = 532.65

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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.