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Finding the Fourth Proportional to 927.05, 1,389.78 and 406.65

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Solution

The fourth proportional to 927.05, 1,389.78 and 406.65 is: 609.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.05 : 1,389.78 = 406.65 : x
  2. Step 2: Convert to fraction form
    927.05/1,389.78 = 406.65/x
  3. Step 3: Cross multiply
    927.05x = 1,389.78 × 406.65
  4. Step 4: Simplify right side
    927.05x = 565,152.81
  5. Step 5: Solve for x
    x = 565,152.81/927.05
  6. Step 6: Final answer
    x = 609.63

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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.