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Finding the Fourth Proportional to 1,689.40, 2,533.46 and 519.05

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Solution

The fourth proportional to 1,689.40, 2,533.46 and 519.05 is: 778.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.40 : 2,533.46 = 519.05 : x
  2. Step 2: Convert to fraction form
    1,689.40/2,533.46 = 519.05/x
  3. Step 3: Cross multiply
    1,689.40x = 2,533.46 × 519.05
  4. Step 4: Simplify right side
    1,689.40x = 1,314,992.41
  5. Step 5: Solve for x
    x = 1,314,992.41/1,689.40
  6. Step 6: Final answer
    x = 778.38

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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.