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Finding the Fourth Proportional to 682.76, 942.09 and 387.92

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Solution

The fourth proportional to 682.76, 942.09 and 387.92 is: 535.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.76 : 942.09 = 387.92 : x
  2. Step 2: Convert to fraction form
    682.76/942.09 = 387.92/x
  3. Step 3: Cross multiply
    682.76x = 942.09 × 387.92
  4. Step 4: Simplify right side
    682.76x = 365,455.55
  5. Step 5: Solve for x
    x = 365,455.55/682.76
  6. Step 6: Final answer
    x = 535.26

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Find fourth proportional to 341.38, 471.05 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.