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Finding the Fourth Proportional to 958.80, 1,439.44 and 612.08

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Solution

The fourth proportional to 958.80, 1,439.44 and 612.08 is: 918.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.80 : 1,439.44 = 612.08 : x
  2. Step 2: Convert to fraction form
    958.80/1,439.44 = 612.08/x
  3. Step 3: Cross multiply
    958.80x = 1,439.44 × 612.08
  4. Step 4: Simplify right side
    958.80x = 881,052.44
  5. Step 5: Solve for x
    x = 881,052.44/958.80
  6. Step 6: Final answer
    x = 918.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.