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Finding the Fourth Proportional to 1,013.78, 1,518.87 and 687.98

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Solution

The fourth proportional to 1,013.78, 1,518.87 and 687.98 is: 1,030.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.78 : 1,518.87 = 687.98 : x
  2. Step 2: Convert to fraction form
    1,013.78/1,518.87 = 687.98/x
  3. Step 3: Cross multiply
    1,013.78x = 1,518.87 × 687.98
  4. Step 4: Simplify right side
    1,013.78x = 1,044,958.56
  5. Step 5: Solve for x
    x = 1,044,958.56/1,013.78
  6. Step 6: Final answer
    x = 1,030.75

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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.