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Finding the Fourth Proportional to 648.80, 893.40 and 554.84

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Solution

The fourth proportional to 648.80, 893.40 and 554.84 is: 764.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.80 : 893.40 = 554.84 : x
  2. Step 2: Convert to fraction form
    648.80/893.40 = 554.84/x
  3. Step 3: Cross multiply
    648.80x = 893.40 × 554.84
  4. Step 4: Simplify right side
    648.80x = 495,694.06
  5. Step 5: Solve for x
    x = 495,694.06/648.80
  6. Step 6: Final answer
    x = 764.02

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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.