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Finding the Fourth Proportional to 688.30, 949.74 and 393.46

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Solution

The fourth proportional to 688.30, 949.74 and 393.46 is: 542.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.30 : 949.74 = 393.46 : x
  2. Step 2: Convert to fraction form
    688.30/949.74 = 393.46/x
  3. Step 3: Cross multiply
    688.30x = 949.74 × 393.46
  4. Step 4: Simplify right side
    688.30x = 373,684.70
  5. Step 5: Solve for x
    x = 373,684.70/688.30
  6. Step 6: Final answer
    x = 542.91

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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.