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Finding the Fourth Proportional to 1,678.36, 2,517.54 and 813.40

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Solution

The fourth proportional to 1,678.36, 2,517.54 and 813.40 is: 1,220.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.36 : 2,517.54 = 813.40 : x
  2. Step 2: Convert to fraction form
    1,678.36/2,517.54 = 813.40/x
  3. Step 3: Cross multiply
    1,678.36x = 2,517.54 × 813.40
  4. Step 4: Simplify right side
    1,678.36x = 2,047,767.04
  5. Step 5: Solve for x
    x = 2,047,767.04/1,678.36
  6. Step 6: Final answer
    x = 1,220.10

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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.