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Finding the Fourth Proportional to 837.85, 1,155.21 and 696.10

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Solution

The fourth proportional to 837.85, 1,155.21 and 696.10 is: 959.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.85 : 1,155.21 = 696.10 : x
  2. Step 2: Convert to fraction form
    837.85/1,155.21 = 696.10/x
  3. Step 3: Cross multiply
    837.85x = 1,155.21 × 696.10
  4. Step 4: Simplify right side
    837.85x = 804,141.68
  5. Step 5: Solve for x
    x = 804,141.68/837.85
  6. Step 6: Final answer
    x = 959.77

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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.