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Finding the Fourth Proportional to 682.40, 942.36 and 558.20

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Solution

The fourth proportional to 682.40, 942.36 and 558.20 is: 770.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.40 : 942.36 = 558.20 : x
  2. Step 2: Convert to fraction form
    682.40/942.36 = 558.20/x
  3. Step 3: Cross multiply
    682.40x = 942.36 × 558.20
  4. Step 4: Simplify right side
    682.40x = 526,025.35
  5. Step 5: Solve for x
    x = 526,025.35/682.40
  6. Step 6: Final answer
    x = 770.85

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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.