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Finding the Fourth Proportional to 626.76, 865.17 and 393.84

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Solution

The fourth proportional to 626.76, 865.17 and 393.84 is: 543.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.76 : 865.17 = 393.84 : x
  2. Step 2: Convert to fraction form
    626.76/865.17 = 393.84/x
  3. Step 3: Cross multiply
    626.76x = 865.17 × 393.84
  4. Step 4: Simplify right side
    626.76x = 340,738.55
  5. Step 5: Solve for x
    x = 340,738.55/626.76
  6. Step 6: Final answer
    x = 543.65

Related Problems

Find fourth proportional to 313.38, 432.59 and 196.92
Half scale
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Double scale
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Similar ratio
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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.