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Finding the Fourth Proportional to 1,223.63, 1,688.60 and 671.63

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Solution

The fourth proportional to 1,223.63, 1,688.60 and 671.63 is: 926.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.63 : 1,688.60 = 671.63 : x
  2. Step 2: Convert to fraction form
    1,223.63/1,688.60 = 671.63/x
  3. Step 3: Cross multiply
    1,223.63x = 1,688.60 × 671.63
  4. Step 4: Simplify right side
    1,223.63x = 1,134,107.65
  5. Step 5: Solve for x
    x = 1,134,107.65/1,223.63
  6. Step 6: Final answer
    x = 926.84

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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.