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Finding the Fourth Proportional to 642.84, 886.60 and 465.45

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Solution

The fourth proportional to 642.84, 886.60 and 465.45 is: 641.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.84 : 886.60 = 465.45 : x
  2. Step 2: Convert to fraction form
    642.84/886.60 = 465.45/x
  3. Step 3: Cross multiply
    642.84x = 886.60 × 465.45
  4. Step 4: Simplify right side
    642.84x = 412,662.61
  5. Step 5: Solve for x
    x = 412,662.61/642.84
  6. Step 6: Final answer
    x = 641.94

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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.