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Finding the Fourth Proportional to 673.56, 1,010.74 and 381.68

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Solution

The fourth proportional to 673.56, 1,010.74 and 381.68 is: 572.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.56 : 1,010.74 = 381.68 : x
  2. Step 2: Convert to fraction form
    673.56/1,010.74 = 381.68/x
  3. Step 3: Cross multiply
    673.56x = 1,010.74 × 381.68
  4. Step 4: Simplify right side
    673.56x = 385,779.24
  5. Step 5: Solve for x
    x = 385,779.24/673.56
  6. Step 6: Final answer
    x = 572.75

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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.