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Finding the Fourth Proportional to 929.63, 1,399.97 and 809.35

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Solution

The fourth proportional to 929.63, 1,399.97 and 809.35 is: 1,218.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.63 : 1,399.97 = 809.35 : x
  2. Step 2: Convert to fraction form
    929.63/1,399.97 = 809.35/x
  3. Step 3: Cross multiply
    929.63x = 1,399.97 × 809.35
  4. Step 4: Simplify right side
    929.63x = 1,133,064.24
  5. Step 5: Solve for x
    x = 1,133,064.24/929.63
  6. Step 6: Final answer
    x = 1,218.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.