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Finding the Fourth Proportional to 1,265.27, 1,899.67 and 649.41

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Solution

The fourth proportional to 1,265.27, 1,899.67 and 649.41 is: 975.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.27 : 1,899.67 = 649.41 : x
  2. Step 2: Convert to fraction form
    1,265.27/1,899.67 = 649.41/x
  3. Step 3: Cross multiply
    1,265.27x = 1,899.67 × 649.41
  4. Step 4: Simplify right side
    1,265.27x = 1,233,664.69
  5. Step 5: Solve for x
    x = 1,233,664.69/1,265.27
  6. Step 6: Final answer
    x = 975.02

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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.