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Finding the Fourth Proportional to 1,678.59, 2,518.08 and 639.38

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Solution

The fourth proportional to 1,678.59, 2,518.08 and 639.38 is: 959.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.59 : 2,518.08 = 639.38 : x
  2. Step 2: Convert to fraction form
    1,678.59/2,518.08 = 639.38/x
  3. Step 3: Cross multiply
    1,678.59x = 2,518.08 × 639.38
  4. Step 4: Simplify right side
    1,678.59x = 1,609,997.40
  5. Step 5: Solve for x
    x = 1,609,997.40/1,678.59
  6. Step 6: Final answer
    x = 959.14

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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.