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Finding the Fourth Proportional to 920.53, 1,377.55 and 641.53

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Solution

The fourth proportional to 920.53, 1,377.55 and 641.53 is: 960.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.53 : 1,377.55 = 641.53 : x
  2. Step 2: Convert to fraction form
    920.53/1,377.55 = 641.53/x
  3. Step 3: Cross multiply
    920.53x = 1,377.55 × 641.53
  4. Step 4: Simplify right side
    920.53x = 883,739.65
  5. Step 5: Solve for x
    x = 883,739.65/920.53
  6. Step 6: Final answer
    x = 960.03

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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.