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Finding the Fourth Proportional to 676.60, 1,014.90 and 431.80

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Solution

The fourth proportional to 676.60, 1,014.90 and 431.80 is: 647.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.60 : 1,014.90 = 431.80 : x
  2. Step 2: Convert to fraction form
    676.60/1,014.90 = 431.80/x
  3. Step 3: Cross multiply
    676.60x = 1,014.90 × 431.80
  4. Step 4: Simplify right side
    676.60x = 438,233.82
  5. Step 5: Solve for x
    x = 438,233.82/676.60
  6. Step 6: Final answer
    x = 647.70

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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.