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Finding the Fourth Proportional to 673.60, 1,010.40 and 345.55

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Solution

The fourth proportional to 673.60, 1,010.40 and 345.55 is: 518.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.60 : 1,010.40 = 345.55 : x
  2. Step 2: Convert to fraction form
    673.60/1,010.40 = 345.55/x
  3. Step 3: Cross multiply
    673.60x = 1,010.40 × 345.55
  4. Step 4: Simplify right side
    673.60x = 349,143.72
  5. Step 5: Solve for x
    x = 349,143.72/673.60
  6. Step 6: Final answer
    x = 518.33

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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.