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Finding the Fourth Proportional to 1,184.74, 1,634.94 and 687.67

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Solution

The fourth proportional to 1,184.74, 1,634.94 and 687.67 is: 948.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,184.74 : 1,634.94 = 687.67 : x
  2. Step 2: Convert to fraction form
    1,184.74/1,634.94 = 687.67/x
  3. Step 3: Cross multiply
    1,184.74x = 1,634.94 × 687.67
  4. Step 4: Simplify right side
    1,184.74x = 1,124,295.10
  5. Step 5: Solve for x
    x = 1,124,295.10/1,184.74
  6. Step 6: Final answer
    x = 948.98

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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.