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Finding the Fourth Proportional to 920.26, 1,269.95 and 500.60

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Solution

The fourth proportional to 920.26, 1,269.95 and 500.60 is: 690.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.26 : 1,269.95 = 500.60 : x
  2. Step 2: Convert to fraction form
    920.26/1,269.95 = 500.60/x
  3. Step 3: Cross multiply
    920.26x = 1,269.95 × 500.60
  4. Step 4: Simplify right side
    920.26x = 635,736.97
  5. Step 5: Solve for x
    x = 635,736.97/920.26
  6. Step 6: Final answer
    x = 690.82

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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.