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Finding the Fourth Proportional to 921.33, 1,379.88 and 509.67

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Solution

The fourth proportional to 921.33, 1,379.88 and 509.67 is: 763.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.33 : 1,379.88 = 509.67 : x
  2. Step 2: Convert to fraction form
    921.33/1,379.88 = 509.67/x
  3. Step 3: Cross multiply
    921.33x = 1,379.88 × 509.67
  4. Step 4: Simplify right side
    921.33x = 703,283.44
  5. Step 5: Solve for x
    x = 703,283.44/921.33
  6. Step 6: Final answer
    x = 763.34

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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.