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Finding the Fourth Proportional to 834.25, 1,151.31 and 485.05

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Solution

The fourth proportional to 834.25, 1,151.31 and 485.05 is: 669.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.25 : 1,151.31 = 485.05 : x
  2. Step 2: Convert to fraction form
    834.25/1,151.31 = 485.05/x
  3. Step 3: Cross multiply
    834.25x = 1,151.31 × 485.05
  4. Step 4: Simplify right side
    834.25x = 558,442.92
  5. Step 5: Solve for x
    x = 558,442.92/834.25
  6. Step 6: Final answer
    x = 669.40

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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.