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Finding the Fourth Proportional to 1,382.40, 1,908.18 and 989.64

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Solution

The fourth proportional to 1,382.40, 1,908.18 and 989.64 is: 1,366.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.40 : 1,908.18 = 989.64 : x
  2. Step 2: Convert to fraction form
    1,382.40/1,908.18 = 989.64/x
  3. Step 3: Cross multiply
    1,382.40x = 1,908.18 × 989.64
  4. Step 4: Simplify right side
    1,382.40x = 1,888,411.26
  5. Step 5: Solve for x
    x = 1,888,411.26/1,382.40
  6. Step 6: Final answer
    x = 1,366.04

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1.5x scale

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.