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Finding the Fourth Proportional to 1,254.21, 1,882.47 and 638.33

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Solution

The fourth proportional to 1,254.21, 1,882.47 and 638.33 is: 958.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.21 : 1,882.47 = 638.33 : x
  2. Step 2: Convert to fraction form
    1,254.21/1,882.47 = 638.33/x
  3. Step 3: Cross multiply
    1,254.21x = 1,882.47 × 638.33
  4. Step 4: Simplify right side
    1,254.21x = 1,201,627.66
  5. Step 5: Solve for x
    x = 1,201,627.66/1,254.21
  6. Step 6: Final answer
    x = 958.08

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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.