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Finding the Fourth Proportional to 929.34, 1,279.58 and 789.18

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Solution

The fourth proportional to 929.34, 1,279.58 and 789.18 is: 1,086.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.34 : 1,279.58 = 789.18 : x
  2. Step 2: Convert to fraction form
    929.34/1,279.58 = 789.18/x
  3. Step 3: Cross multiply
    929.34x = 1,279.58 × 789.18
  4. Step 4: Simplify right side
    929.34x = 1,009,815.00
  5. Step 5: Solve for x
    x = 1,009,815.00/929.34
  6. Step 6: Final answer
    x = 1,086.59

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1.5x scale

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.