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Finding the Fourth Proportional to 881.72, 1,216.12 and 776.72

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Solution

The fourth proportional to 881.72, 1,216.12 and 776.72 is: 1,071.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.72 : 1,216.12 = 776.72 : x
  2. Step 2: Convert to fraction form
    881.72/1,216.12 = 776.72/x
  3. Step 3: Cross multiply
    881.72x = 1,216.12 × 776.72
  4. Step 4: Simplify right side
    881.72x = 944,584.73
  5. Step 5: Solve for x
    x = 944,584.73/881.72
  6. Step 6: Final answer
    x = 1,071.30

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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.