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Finding the Fourth Proportional to 837.90, 1,256.76 and 427.30

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Solution

The fourth proportional to 837.90, 1,256.76 and 427.30 is: 640.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.90 : 1,256.76 = 427.30 : x
  2. Step 2: Convert to fraction form
    837.90/1,256.76 = 427.30/x
  3. Step 3: Cross multiply
    837.90x = 1,256.76 × 427.30
  4. Step 4: Simplify right side
    837.90x = 537,013.55
  5. Step 5: Solve for x
    x = 537,013.55/837.90
  6. Step 6: Final answer
    x = 640.90

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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.