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Finding the Fourth Proportional to 1,425.68, 2,138.64 and 656

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Solution

The fourth proportional to 1,425.68, 2,138.64 and 656 is: 984.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.68 : 2,138.64 = 656 : x
  2. Step 2: Convert to fraction form
    1,425.68/2,138.64 = 656/x
  3. Step 3: Cross multiply
    1,425.68x = 2,138.64 × 656
  4. Step 4: Simplify right side
    1,425.68x = 1,402,947.84
  5. Step 5: Solve for x
    x = 1,402,947.84/1,425.68
  6. Step 6: Final answer
    x = 984.06

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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.