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Finding the Fourth Proportional to 1,265.28, 1,897.37 and 485.46

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Solution

The fourth proportional to 1,265.28, 1,897.37 and 485.46 is: 727.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.28 : 1,897.37 = 485.46 : x
  2. Step 2: Convert to fraction form
    1,265.28/1,897.37 = 485.46/x
  3. Step 3: Cross multiply
    1,265.28x = 1,897.37 × 485.46
  4. Step 4: Simplify right side
    1,265.28x = 921,097.24
  5. Step 5: Solve for x
    x = 921,097.24/1,265.28
  6. Step 6: Final answer
    x = 727.98

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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.