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Finding the Fourth Proportional to 1,687.40, 2,530.98 and 517.30

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Solution

The fourth proportional to 1,687.40, 2,530.98 and 517.30 is: 775.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.40 : 2,530.98 = 517.30 : x
  2. Step 2: Convert to fraction form
    1,687.40/2,530.98 = 517.30/x
  3. Step 3: Cross multiply
    1,687.40x = 2,530.98 × 517.30
  4. Step 4: Simplify right side
    1,687.40x = 1,309,267.69
  5. Step 5: Solve for x
    x = 1,309,267.69/1,687.40
  6. Step 6: Final answer
    x = 775.91

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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.