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Finding the Fourth Proportional to 881.78, 1,322.70 and 419.12

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Solution

The fourth proportional to 881.78, 1,322.70 and 419.12 is: 628.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.78 : 1,322.70 = 419.12 : x
  2. Step 2: Convert to fraction form
    881.78/1,322.70 = 419.12/x
  3. Step 3: Cross multiply
    881.78x = 1,322.70 × 419.12
  4. Step 4: Simplify right side
    881.78x = 554,370.02
  5. Step 5: Solve for x
    x = 554,370.02/881.78
  6. Step 6: Final answer
    x = 628.69

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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.