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Finding the Fourth Proportional to 1,322.36, 1,983.88 and 775

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Solution

The fourth proportional to 1,322.36, 1,983.88 and 775 is: 1,162.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.36 : 1,983.88 = 775 : x
  2. Step 2: Convert to fraction form
    1,322.36/1,983.88 = 775/x
  3. Step 3: Cross multiply
    1,322.36x = 1,983.88 × 775
  4. Step 4: Simplify right side
    1,322.36x = 1,537,507
  5. Step 5: Solve for x
    x = 1,537,507/1,322.36
  6. Step 6: Final answer
    x = 1,162.70

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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.