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Finding the Fourth Proportional to 1,015.80, 1,523.86 and 438.68

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Solution

The fourth proportional to 1,015.80, 1,523.86 and 438.68 is: 658.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.80 : 1,523.86 = 438.68 : x
  2. Step 2: Convert to fraction form
    1,015.80/1,523.86 = 438.68/x
  3. Step 3: Cross multiply
    1,015.80x = 1,523.86 × 438.68
  4. Step 4: Simplify right side
    1,015.80x = 668,486.90
  5. Step 5: Solve for x
    x = 668,486.90/1,015.80
  6. Step 6: Final answer
    x = 658.09

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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.