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Finding the Fourth Proportional to 929.65, 1,394.59 and 490.92

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Solution

The fourth proportional to 929.65, 1,394.59 and 490.92 is: 736.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.65 : 1,394.59 = 490.92 : x
  2. Step 2: Convert to fraction form
    929.65/1,394.59 = 490.92/x
  3. Step 3: Cross multiply
    929.65x = 1,394.59 × 490.92
  4. Step 4: Simplify right side
    929.65x = 684,626.19
  5. Step 5: Solve for x
    x = 684,626.19/929.65
  6. Step 6: Final answer
    x = 736.44

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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.