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Finding the Fourth Proportional to 1,272.36, 1,908.72 and 656.40

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Solution

The fourth proportional to 1,272.36, 1,908.72 and 656.40 is: 984.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.36 : 1,908.72 = 656.40 : x
  2. Step 2: Convert to fraction form
    1,272.36/1,908.72 = 656.40/x
  3. Step 3: Cross multiply
    1,272.36x = 1,908.72 × 656.40
  4. Step 4: Simplify right side
    1,272.36x = 1,252,883.81
  5. Step 5: Solve for x
    x = 1,252,883.81/1,272.36
  6. Step 6: Final answer
    x = 984.69

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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.