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Finding the Fourth Proportional to 1,052.85, 1,579.28 and 642.79

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Solution

The fourth proportional to 1,052.85, 1,579.28 and 642.79 is: 964.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,052.85 : 1,579.28 = 642.79 : x
  2. Step 2: Convert to fraction form
    1,052.85/1,579.28 = 642.79/x
  3. Step 3: Cross multiply
    1,052.85x = 1,579.28 × 642.79
  4. Step 4: Simplify right side
    1,052.85x = 1,015,145.39
  5. Step 5: Solve for x
    x = 1,015,145.39/1,052.85
  6. Step 6: Final answer
    x = 964.19

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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.