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Finding the Fourth Proportional to 1,100.66, 1,519.56 and 977.64

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Solution

The fourth proportional to 1,100.66, 1,519.56 and 977.64 is: 1,349.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.66 : 1,519.56 = 977.64 : x
  2. Step 2: Convert to fraction form
    1,100.66/1,519.56 = 977.64/x
  3. Step 3: Cross multiply
    1,100.66x = 1,519.56 × 977.64
  4. Step 4: Simplify right side
    1,100.66x = 1,485,576.94
  5. Step 5: Solve for x
    x = 1,485,576.94/1,100.66
  6. Step 6: Final answer
    x = 1,349.72

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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.