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Finding the Fourth Proportional to 993.14, 1,371.64 and 771.76

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Solution

The fourth proportional to 993.14, 1,371.64 and 771.76 is: 1,065.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.14 : 1,371.64 = 771.76 : x
  2. Step 2: Convert to fraction form
    993.14/1,371.64 = 771.76/x
  3. Step 3: Cross multiply
    993.14x = 1,371.64 × 771.76
  4. Step 4: Simplify right side
    993.14x = 1,058,576.89
  5. Step 5: Solve for x
    x = 1,058,576.89/993.14
  6. Step 6: Final answer
    x = 1,065.89

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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.