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Finding the Fourth Proportional to 874.64, 1,310.80 and 642.44

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Solution

The fourth proportional to 874.64, 1,310.80 and 642.44 is: 962.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.64 : 1,310.80 = 642.44 : x
  2. Step 2: Convert to fraction form
    874.64/1,310.80 = 642.44/x
  3. Step 3: Cross multiply
    874.64x = 1,310.80 × 642.44
  4. Step 4: Simplify right side
    874.64x = 842,102.19
  5. Step 5: Solve for x
    x = 842,102.19/874.64
  6. Step 6: Final answer
    x = 962.80

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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.