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Finding the Fourth Proportional to 1,800.38, 2,700.83 and 646.40

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Solution

The fourth proportional to 1,800.38, 2,700.83 and 646.40 is: 969.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,800.38 : 2,700.83 = 646.40 : x
  2. Step 2: Convert to fraction form
    1,800.38/2,700.83 = 646.40/x
  3. Step 3: Cross multiply
    1,800.38x = 2,700.83 × 646.40
  4. Step 4: Simplify right side
    1,800.38x = 1,745,804.62
  5. Step 5: Solve for x
    x = 1,745,804.62/1,800.38
  6. Step 6: Final answer
    x = 969.69

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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.