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Finding the Fourth Proportional to 629.46, 868.56 and 380.76

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Solution

The fourth proportional to 629.46, 868.56 and 380.76 is: 525.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.46 : 868.56 = 380.76 : x
  2. Step 2: Convert to fraction form
    629.46/868.56 = 380.76/x
  3. Step 3: Cross multiply
    629.46x = 868.56 × 380.76
  4. Step 4: Simplify right side
    629.46x = 330,712.91
  5. Step 5: Solve for x
    x = 330,712.91/629.46
  6. Step 6: Final answer
    x = 525.39

Related Problems

Find fourth proportional to 314.73, 434.28 and 190.38
Half 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.