Home / 1,636.20-2,455.38-905.40

Finding the Fourth Proportional to 1,636.20, 2,455.38 and 905.40

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Solution

The fourth proportional to 1,636.20, 2,455.38 and 905.40 is: 1,358.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,636.20 : 2,455.38 = 905.40 : x
  2. Step 2: Convert to fraction form
    1,636.20/2,455.38 = 905.40/x
  3. Step 3: Cross multiply
    1,636.20x = 2,455.38 × 905.40
  4. Step 4: Simplify right side
    1,636.20x = 2,223,101.05
  5. Step 5: Solve for x
    x = 2,223,101.05/1,636.20
  6. Step 6: Final answer
    x = 1,358.70

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1.5x scale

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.