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Finding the Fourth Proportional to 682.80, 942.48 and 486.36

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Solution

The fourth proportional to 682.80, 942.48 and 486.36 is: 671.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.80 : 942.48 = 486.36 : x
  2. Step 2: Convert to fraction form
    682.80/942.48 = 486.36/x
  3. Step 3: Cross multiply
    682.80x = 942.48 × 486.36
  4. Step 4: Simplify right side
    682.80x = 458,384.57
  5. Step 5: Solve for x
    x = 458,384.57/682.80
  6. Step 6: Final answer
    x = 671.33

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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.