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Finding the Fourth Proportional to 837.21, 1,155.39 and 518.25

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Solution

The fourth proportional to 837.21, 1,155.39 and 518.25 is: 715.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.21 : 1,155.39 = 518.25 : x
  2. Step 2: Convert to fraction form
    837.21/1,155.39 = 518.25/x
  3. Step 3: Cross multiply
    837.21x = 1,155.39 × 518.25
  4. Step 4: Simplify right side
    837.21x = 598,780.87
  5. Step 5: Solve for x
    x = 598,780.87/837.21
  6. Step 6: Final answer
    x = 715.21

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1.5x scale

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.