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Finding the Fourth Proportional to 628.45, 942.51 and 189.70

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Solution

The fourth proportional to 628.45, 942.51 and 189.70 is: 284.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.45 : 942.51 = 189.70 : x
  2. Step 2: Convert to fraction form
    628.45/942.51 = 189.70/x
  3. Step 3: Cross multiply
    628.45x = 942.51 × 189.70
  4. Step 4: Simplify right side
    628.45x = 178,794.15
  5. Step 5: Solve for x
    x = 178,794.15/628.45
  6. Step 6: Final answer
    x = 284.50

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.