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Finding the Fourth Proportional to 673.14, 1,010.10 and 429.78

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Solution

The fourth proportional to 673.14, 1,010.10 and 429.78 is: 644.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.14 : 1,010.10 = 429.78 : x
  2. Step 2: Convert to fraction form
    673.14/1,010.10 = 429.78/x
  3. Step 3: Cross multiply
    673.14x = 1,010.10 × 429.78
  4. Step 4: Simplify right side
    673.14x = 434,120.78
  5. Step 5: Solve for x
    x = 434,120.78/673.14
  6. Step 6: Final answer
    x = 644.92

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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.