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Finding the Fourth Proportional to 929.69, 1,283.27 and 668.46

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Solution

The fourth proportional to 929.69, 1,283.27 and 668.46 is: 922.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.69 : 1,283.27 = 668.46 : x
  2. Step 2: Convert to fraction form
    929.69/1,283.27 = 668.46/x
  3. Step 3: Cross multiply
    929.69x = 1,283.27 × 668.46
  4. Step 4: Simplify right side
    929.69x = 857,814.66
  5. Step 5: Solve for x
    x = 857,814.66/929.69
  6. Step 6: Final answer
    x = 922.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.