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Finding the Fourth Proportional to 1,320.29, 1,822.61 and 989.81

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Solution

The fourth proportional to 1,320.29, 1,822.61 and 989.81 is: 1,366.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.29 : 1,822.61 = 989.81 : x
  2. Step 2: Convert to fraction form
    1,320.29/1,822.61 = 989.81/x
  3. Step 3: Cross multiply
    1,320.29x = 1,822.61 × 989.81
  4. Step 4: Simplify right side
    1,320.29x = 1,804,037.60
  5. Step 5: Solve for x
    x = 1,804,037.60/1,320.29
  6. Step 6: Final answer
    x = 1,366.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.