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Finding the Fourth Proportional to 648.78, 895.31 and 354.06

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Solution

The fourth proportional to 648.78, 895.31 and 354.06 is: 488.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.78 : 895.31 = 354.06 : x
  2. Step 2: Convert to fraction form
    648.78/895.31 = 354.06/x
  3. Step 3: Cross multiply
    648.78x = 895.31 × 354.06
  4. Step 4: Simplify right side
    648.78x = 316,991.69
  5. Step 5: Solve for x
    x = 316,991.69/648.78
  6. Step 6: Final answer
    x = 488.60

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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.