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Finding the Fourth Proportional to 642.16, 963.46 and 368.48

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Solution

The fourth proportional to 642.16, 963.46 and 368.48 is: 552.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.16 : 963.46 = 368.48 : x
  2. Step 2: Convert to fraction form
    642.16/963.46 = 368.48/x
  3. Step 3: Cross multiply
    642.16x = 963.46 × 368.48
  4. Step 4: Simplify right side
    642.16x = 355,015.74
  5. Step 5: Solve for x
    x = 355,015.74/642.16
  6. Step 6: Final answer
    x = 552.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.