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Finding the Fourth Proportional to 920.70, 1,376.73 and 644.85

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Solution

The fourth proportional to 920.70, 1,376.73 and 644.85 is: 964.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.70 : 1,376.73 = 644.85 : x
  2. Step 2: Convert to fraction form
    920.70/1,376.73 = 644.85/x
  3. Step 3: Cross multiply
    920.70x = 1,376.73 × 644.85
  4. Step 4: Simplify right side
    920.70x = 887,784.34
  5. Step 5: Solve for x
    x = 887,784.34/920.70
  6. Step 6: Final answer
    x = 964.25

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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.