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Finding the Fourth Proportional to 971.76, 1,340.64 and 622.44

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Solution

The fourth proportional to 971.76, 1,340.64 and 622.44 is: 858.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.76 : 1,340.64 = 622.44 : x
  2. Step 2: Convert to fraction form
    971.76/1,340.64 = 622.44/x
  3. Step 3: Cross multiply
    971.76x = 1,340.64 × 622.44
  4. Step 4: Simplify right side
    971.76x = 834,467.96
  5. Step 5: Solve for x
    x = 834,467.96/971.76
  6. Step 6: Final answer
    x = 858.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.