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Finding the Fourth Proportional to 1,137.78, 1,576.76 and 1,123.86

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Solution

The fourth proportional to 1,137.78, 1,576.76 and 1,123.86 is: 1,557.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.78 : 1,576.76 = 1,123.86 : x
  2. Step 2: Convert to fraction form
    1,137.78/1,576.76 = 1,123.86/x
  3. Step 3: Cross multiply
    1,137.78x = 1,576.76 × 1,123.86
  4. Step 4: Simplify right side
    1,137.78x = 1,772,051.87
  5. Step 5: Solve for x
    x = 1,772,051.87/1,137.78
  6. Step 6: Final answer
    x = 1,557.46

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.