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Finding the Fourth Proportional to 642.94, 887.26 and 348.21

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Solution

The fourth proportional to 642.94, 887.26 and 348.21 is: 480.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.94 : 887.26 = 348.21 : x
  2. Step 2: Convert to fraction form
    642.94/887.26 = 348.21/x
  3. Step 3: Cross multiply
    642.94x = 887.26 × 348.21
  4. Step 4: Simplify right side
    642.94x = 308,946.63
  5. Step 5: Solve for x
    x = 308,946.63/642.94
  6. Step 6: Final answer
    x = 480.53

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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.