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Finding the Fourth Proportional to 929.30, 1,281.45 and 789.88

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Solution

The fourth proportional to 929.30, 1,281.45 and 789.88 is: 1,089.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.30 : 1,281.45 = 789.88 : x
  2. Step 2: Convert to fraction form
    929.30/1,281.45 = 789.88/x
  3. Step 3: Cross multiply
    929.30x = 1,281.45 × 789.88
  4. Step 4: Simplify right side
    929.30x = 1,012,191.73
  5. Step 5: Solve for x
    x = 1,012,191.73/929.30
  6. Step 6: Final answer
    x = 1,089.19

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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.