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Finding the Fourth Proportional to 682.12, 940.08 and 485.56

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Solution

The fourth proportional to 682.12, 940.08 and 485.56 is: 669.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.12 : 940.08 = 485.56 : x
  2. Step 2: Convert to fraction form
    682.12/940.08 = 485.56/x
  3. Step 3: Cross multiply
    682.12x = 940.08 × 485.56
  4. Step 4: Simplify right side
    682.12x = 456,465.24
  5. Step 5: Solve for x
    x = 456,465.24/682.12
  6. Step 6: Final answer
    x = 669.19

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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.