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Finding the Fourth Proportional to 902.76, 1,245.81 and 553.38

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Solution

The fourth proportional to 902.76, 1,245.81 and 553.38 is: 763.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.76 : 1,245.81 = 553.38 : x
  2. Step 2: Convert to fraction form
    902.76/1,245.81 = 553.38/x
  3. Step 3: Cross multiply
    902.76x = 1,245.81 × 553.38
  4. Step 4: Simplify right side
    902.76x = 689,406.34
  5. Step 5: Solve for x
    x = 689,406.34/902.76
  6. Step 6: Final answer
    x = 763.67

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Double 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.