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Finding the Fourth Proportional to 1,234.66, 1,849.66 and 687.30

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Solution

The fourth proportional to 1,234.66, 1,849.66 and 687.30 is: 1,029.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,234.66 : 1,849.66 = 687.30 : x
  2. Step 2: Convert to fraction form
    1,234.66/1,849.66 = 687.30/x
  3. Step 3: Cross multiply
    1,234.66x = 1,849.66 × 687.30
  4. Step 4: Simplify right side
    1,234.66x = 1,271,271.32
  5. Step 5: Solve for x
    x = 1,271,271.32/1,234.66
  6. Step 6: Final answer
    x = 1,029.65

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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.