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Finding the Fourth Proportional to 638.67, 957.65 and 227.75

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Solution

The fourth proportional to 638.67, 957.65 and 227.75 is: 341.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.67 : 957.65 = 227.75 : x
  2. Step 2: Convert to fraction form
    638.67/957.65 = 227.75/x
  3. Step 3: Cross multiply
    638.67x = 957.65 × 227.75
  4. Step 4: Simplify right side
    638.67x = 218,098.86
  5. Step 5: Solve for x
    x = 218,098.86/638.67
  6. Step 6: Final answer
    x = 341.49

Related Problems

Find fourth proportional to 319.34, 478.82 and 113.87
Half scale
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Double scale
Find fourth proportional to 639.67, 959.14 and 228.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.