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Finding the Fourth Proportional to 667.15, 920.61 and 401.63

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Solution

The fourth proportional to 667.15, 920.61 and 401.63 is: 554.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.15 : 920.61 = 401.63 : x
  2. Step 2: Convert to fraction form
    667.15/920.61 = 401.63/x
  3. Step 3: Cross multiply
    667.15x = 920.61 × 401.63
  4. Step 4: Simplify right side
    667.15x = 369,746.90
  5. Step 5: Solve for x
    x = 369,746.90/667.15
  6. Step 6: Final answer
    x = 554.22

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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.