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Finding the Fourth Proportional to 648.95, 895.55 and 354.21

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Solution

The fourth proportional to 648.95, 895.55 and 354.21 is: 488.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.95 : 895.55 = 354.21 : x
  2. Step 2: Convert to fraction form
    648.95/895.55 = 354.21/x
  3. Step 3: Cross multiply
    648.95x = 895.55 × 354.21
  4. Step 4: Simplify right side
    648.95x = 317,216.19
  5. Step 5: Solve for x
    x = 317,216.19/648.95
  6. Step 6: Final answer
    x = 488.81

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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.