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Finding the Fourth Proportional to 929.88, 1,281.42 and 667.44

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Solution

The fourth proportional to 929.88, 1,281.42 and 667.44 is: 919.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.88 : 1,281.42 = 667.44 : x
  2. Step 2: Convert to fraction form
    929.88/1,281.42 = 667.44/x
  3. Step 3: Cross multiply
    929.88x = 1,281.42 × 667.44
  4. Step 4: Simplify right side
    929.88x = 855,270.96
  5. Step 5: Solve for x
    x = 855,270.96/929.88
  6. Step 6: Final answer
    x = 919.76

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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.