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Finding the Fourth Proportional to 688.35, 949.92 and 393.61

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Solution

The fourth proportional to 688.35, 949.92 and 393.61 is: 543.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.35 : 949.92 = 393.61 : x
  2. Step 2: Convert to fraction form
    688.35/949.92 = 393.61/x
  3. Step 3: Cross multiply
    688.35x = 949.92 × 393.61
  4. Step 4: Simplify right side
    688.35x = 373,898.01
  5. Step 5: Solve for x
    x = 373,898.01/688.35
  6. Step 6: Final answer
    x = 543.18

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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.