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Finding the Fourth Proportional to 946.95, 1,299.80 and 839.76

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Solution

The fourth proportional to 946.95, 1,299.80 and 839.76 is: 1,152.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.95 : 1,299.80 = 839.76 : x
  2. Step 2: Convert to fraction form
    946.95/1,299.80 = 839.76/x
  3. Step 3: Cross multiply
    946.95x = 1,299.80 × 839.76
  4. Step 4: Simplify right side
    946.95x = 1,091,520.05
  5. Step 5: Solve for x
    x = 1,091,520.05/946.95
  6. Step 6: Final answer
    x = 1,152.67

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.