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Finding the Fourth Proportional to 1,272.01, 1,908.72 and 687.00

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Solution

The fourth proportional to 1,272.01, 1,908.72 and 687.00 is: 1,030.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.01 : 1,908.72 = 687.00 : x
  2. Step 2: Convert to fraction form
    1,272.01/1,908.72 = 687.00/x
  3. Step 3: Cross multiply
    1,272.01x = 1,908.72 × 687.00
  4. Step 4: Simplify right side
    1,272.01x = 1,311,283.48
  5. Step 5: Solve for x
    x = 1,311,283.48/1,272.01
  6. Step 6: Final answer
    x = 1,030.88

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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.