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Finding the Fourth Proportional to 671.88, 1,011.42 and 518.64

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Solution

The fourth proportional to 671.88, 1,011.42 and 518.64 is: 780.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.88 : 1,011.42 = 518.64 : x
  2. Step 2: Convert to fraction form
    671.88/1,011.42 = 518.64/x
  3. Step 3: Cross multiply
    671.88x = 1,011.42 × 518.64
  4. Step 4: Simplify right side
    671.88x = 524,562.87
  5. Step 5: Solve for x
    x = 524,562.87/671.88
  6. Step 6: Final answer
    x = 780.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.