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Finding the Fourth Proportional to 1,816.87, 2,725.80 and 647.14

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Solution

The fourth proportional to 1,816.87, 2,725.80 and 647.14 is: 970.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,816.87 : 2,725.80 = 647.14 : x
  2. Step 2: Convert to fraction form
    1,816.87/2,725.80 = 647.14/x
  3. Step 3: Cross multiply
    1,816.87x = 2,725.80 × 647.14
  4. Step 4: Simplify right side
    1,816.87x = 1,763,960.58
  5. Step 5: Solve for x
    x = 1,763,960.58/1,816.87
  6. Step 6: Final answer
    x = 970.88

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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.