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Finding the Fourth Proportional to 667.77, 920.40 and 480.98

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Solution

The fourth proportional to 667.77, 920.40 and 480.98 is: 662.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.77 : 920.40 = 480.98 : x
  2. Step 2: Convert to fraction form
    667.77/920.40 = 480.98/x
  3. Step 3: Cross multiply
    667.77x = 920.40 × 480.98
  4. Step 4: Simplify right side
    667.77x = 442,689.39
  5. Step 5: Solve for x
    x = 442,689.39/667.77
  6. Step 6: Final answer
    x = 662.94

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1.5x scale

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.