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Finding the Fourth Proportional to 1,005.19, 1,385.70 and 673.49

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Solution

The fourth proportional to 1,005.19, 1,385.70 and 673.49 is: 928.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.19 : 1,385.70 = 673.49 : x
  2. Step 2: Convert to fraction form
    1,005.19/1,385.70 = 673.49/x
  3. Step 3: Cross multiply
    1,005.19x = 1,385.70 × 673.49
  4. Step 4: Simplify right side
    1,005.19x = 933,255.09
  5. Step 5: Solve for x
    x = 933,255.09/1,005.19
  6. Step 6: Final answer
    x = 928.44

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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.