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Finding the Fourth Proportional to 881.03, 1,215.42 and 619.40

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Solution

The fourth proportional to 881.03, 1,215.42 and 619.40 is: 854.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.03 : 1,215.42 = 619.40 : x
  2. Step 2: Convert to fraction form
    881.03/1,215.42 = 619.40/x
  3. Step 3: Cross multiply
    881.03x = 1,215.42 × 619.40
  4. Step 4: Simplify right side
    881.03x = 752,831.15
  5. Step 5: Solve for x
    x = 752,831.15/881.03
  6. Step 6: Final answer
    x = 854.49

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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.