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Finding the Fourth Proportional to 648.84, 901.62 and 642.18

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Solution

The fourth proportional to 648.84, 901.62 and 642.18 is: 892.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.84 : 901.62 = 642.18 : x
  2. Step 2: Convert to fraction form
    648.84/901.62 = 642.18/x
  3. Step 3: Cross multiply
    648.84x = 901.62 × 642.18
  4. Step 4: Simplify right side
    648.84x = 579,002.33
  5. Step 5: Solve for x
    x = 579,002.33/648.84
  6. Step 6: Final answer
    x = 892.37

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.