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Finding the Fourth Proportional to 929.67, 1,281.18 and 667.23

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Solution

The fourth proportional to 929.67, 1,281.18 and 667.23 is: 919.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.67 : 1,281.18 = 667.23 : x
  2. Step 2: Convert to fraction form
    929.67/1,281.18 = 667.23/x
  3. Step 3: Cross multiply
    929.67x = 1,281.18 × 667.23
  4. Step 4: Simplify right side
    929.67x = 854,841.73
  5. Step 5: Solve for x
    x = 854,841.73/929.67
  6. Step 6: Final answer
    x = 919.51

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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.