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Finding the Fourth Proportional to 642.89, 887.19 and 348.16

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Solution

The fourth proportional to 642.89, 887.19 and 348.16 is: 480.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.89 : 887.19 = 348.16 : x
  2. Step 2: Convert to fraction form
    642.89/887.19 = 348.16/x
  3. Step 3: Cross multiply
    642.89x = 887.19 × 348.16
  4. Step 4: Simplify right side
    642.89x = 308,879.72
  5. Step 5: Solve for x
    x = 308,879.72/642.89
  6. Step 6: Final answer
    x = 480.46

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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.