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Finding the Fourth Proportional to 927.65, 1,389.45 and 406.96

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Solution

The fourth proportional to 927.65, 1,389.45 and 406.96 is: 609.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.65 : 1,389.45 = 406.96 : x
  2. Step 2: Convert to fraction form
    927.65/1,389.45 = 406.96/x
  3. Step 3: Cross multiply
    927.65x = 1,389.45 × 406.96
  4. Step 4: Simplify right side
    927.65x = 565,443.62
  5. Step 5: Solve for x
    x = 565,443.62/927.65
  6. Step 6: Final answer
    x = 609.54

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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.