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Finding the Fourth Proportional to 671.12, 1,006.72 and 286.64

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Solution

The fourth proportional to 671.12, 1,006.72 and 286.64 is: 429.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.12 : 1,006.72 = 286.64 : x
  2. Step 2: Convert to fraction form
    671.12/1,006.72 = 286.64/x
  3. Step 3: Cross multiply
    671.12x = 1,006.72 × 286.64
  4. Step 4: Simplify right side
    671.12x = 288,566.22
  5. Step 5: Solve for x
    x = 288,566.22/671.12
  6. Step 6: Final answer
    x = 429.98

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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.