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Finding the Fourth Proportional to 920.98, 1,380.21 and 607.96

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Solution

The fourth proportional to 920.98, 1,380.21 and 607.96 is: 911.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.98 : 1,380.21 = 607.96 : x
  2. Step 2: Convert to fraction form
    920.98/1,380.21 = 607.96/x
  3. Step 3: Cross multiply
    920.98x = 1,380.21 × 607.96
  4. Step 4: Simplify right side
    920.98x = 839,112.47
  5. Step 5: Solve for x
    x = 839,112.47/920.98
  6. Step 6: Final answer
    x = 911.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.