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Finding the Fourth Proportional to 921.14, 1,379.97 and 458.67

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Solution

The fourth proportional to 921.14, 1,379.97 and 458.67 is: 687.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.14 : 1,379.97 = 458.67 : x
  2. Step 2: Convert to fraction form
    921.14/1,379.97 = 458.67/x
  3. Step 3: Cross multiply
    921.14x = 1,379.97 × 458.67
  4. Step 4: Simplify right side
    921.14x = 632,950.84
  5. Step 5: Solve for x
    x = 632,950.84/921.14
  6. Step 6: Final answer
    x = 687.14

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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.