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Finding the Fourth Proportional to 1,265.75, 1,897.34 and 485.55

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Solution

The fourth proportional to 1,265.75, 1,897.34 and 485.55 is: 727.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.75 : 1,897.34 = 485.55 : x
  2. Step 2: Convert to fraction form
    1,265.75/1,897.34 = 485.55/x
  3. Step 3: Cross multiply
    1,265.75x = 1,897.34 × 485.55
  4. Step 4: Simplify right side
    1,265.75x = 921,251.01
  5. Step 5: Solve for x
    x = 921,251.01/1,265.75
  6. Step 6: Final answer
    x = 727.83

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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.