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Finding the Fourth Proportional to 1,678.42, 2,517.40 and 637.98

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Solution

The fourth proportional to 1,678.42, 2,517.40 and 637.98 is: 956.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.42 : 2,517.40 = 637.98 : x
  2. Step 2: Convert to fraction form
    1,678.42/2,517.40 = 637.98/x
  3. Step 3: Cross multiply
    1,678.42x = 2,517.40 × 637.98
  4. Step 4: Simplify right side
    1,678.42x = 1,606,050.85
  5. Step 5: Solve for x
    x = 1,606,050.85/1,678.42
  6. Step 6: Final answer
    x = 956.88

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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.