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Finding the Fourth Proportional to 1,455.39, 2,179.58 and 906.89

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Solution

The fourth proportional to 1,455.39, 2,179.58 and 906.89 is: 1,358.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.39 : 2,179.58 = 906.89 : x
  2. Step 2: Convert to fraction form
    1,455.39/2,179.58 = 906.89/x
  3. Step 3: Cross multiply
    1,455.39x = 2,179.58 × 906.89
  4. Step 4: Simplify right side
    1,455.39x = 1,976,623.87
  5. Step 5: Solve for x
    x = 1,976,623.87/1,455.39
  6. Step 6: Final answer
    x = 1,358.14

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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.