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Finding the Fourth Proportional to 837.49, 1,256.28 and 426.51

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Solution

The fourth proportional to 837.49, 1,256.28 and 426.51 is: 639.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.49 : 1,256.28 = 426.51 : x
  2. Step 2: Convert to fraction form
    837.49/1,256.28 = 426.51/x
  3. Step 3: Cross multiply
    837.49x = 1,256.28 × 426.51
  4. Step 4: Simplify right side
    837.49x = 535,815.98
  5. Step 5: Solve for x
    x = 535,815.98/837.49
  6. Step 6: Final answer
    x = 639.79

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Double scale
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1.5x scale

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.