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Finding the Fourth Proportional to 834.60, 1,151.85 and 485.29

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Solution

The fourth proportional to 834.60, 1,151.85 and 485.29 is: 669.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.60 : 1,151.85 = 485.29 : x
  2. Step 2: Convert to fraction form
    834.60/1,151.85 = 485.29/x
  3. Step 3: Cross multiply
    834.60x = 1,151.85 × 485.29
  4. Step 4: Simplify right side
    834.60x = 558,973.10
  5. Step 5: Solve for x
    x = 558,973.10/834.60
  6. Step 6: Final answer
    x = 669.75

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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.