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Finding the Fourth Proportional to 648.40, 894.56 and 386.32

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Solution

The fourth proportional to 648.40, 894.56 and 386.32 is: 532.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.40 : 894.56 = 386.32 : x
  2. Step 2: Convert to fraction form
    648.40/894.56 = 386.32/x
  3. Step 3: Cross multiply
    648.40x = 894.56 × 386.32
  4. Step 4: Simplify right side
    648.40x = 345,586.42
  5. Step 5: Solve for x
    x = 345,586.42/648.40
  6. Step 6: Final answer
    x = 532.98

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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.