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Finding the Fourth Proportional to 1,115.63, 1,673.45 and 385.26

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Solution

The fourth proportional to 1,115.63, 1,673.45 and 385.26 is: 577.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.63 : 1,673.45 = 385.26 : x
  2. Step 2: Convert to fraction form
    1,115.63/1,673.45 = 385.26/x
  3. Step 3: Cross multiply
    1,115.63x = 1,673.45 × 385.26
  4. Step 4: Simplify right side
    1,115.63x = 644,713.35
  5. Step 5: Solve for x
    x = 644,713.35/1,115.63
  6. Step 6: Final answer
    x = 577.89

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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.