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Finding the Fourth Proportional to 682.75, 942.21 and 387.91

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Solution

The fourth proportional to 682.75, 942.21 and 387.91 is: 535.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.75 : 942.21 = 387.91 : x
  2. Step 2: Convert to fraction form
    682.75/942.21 = 387.91/x
  3. Step 3: Cross multiply
    682.75x = 942.21 × 387.91
  4. Step 4: Simplify right side
    682.75x = 365,492.68
  5. Step 5: Solve for x
    x = 365,492.68/682.75
  6. Step 6: Final answer
    x = 535.32

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Find fourth proportional to 341.38, 471.11 and 193.96
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Double scale
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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.