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Finding the Fourth Proportional to 1,252.34, 1,876.70 and 920.67

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Solution

The fourth proportional to 1,252.34, 1,876.70 and 920.67 is: 1,379.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.34 : 1,876.70 = 920.67 : x
  2. Step 2: Convert to fraction form
    1,252.34/1,876.70 = 920.67/x
  3. Step 3: Cross multiply
    1,252.34x = 1,876.70 × 920.67
  4. Step 4: Simplify right side
    1,252.34x = 1,727,821.39
  5. Step 5: Solve for x
    x = 1,727,821.39/1,252.34
  6. Step 6: Final answer
    x = 1,379.67

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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.