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Finding the Fourth Proportional to 1,128.32, 1,558.57 and 908.09

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Solution

The fourth proportional to 1,128.32, 1,558.57 and 908.09 is: 1,254.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.32 : 1,558.57 = 908.09 : x
  2. Step 2: Convert to fraction form
    1,128.32/1,558.57 = 908.09/x
  3. Step 3: Cross multiply
    1,128.32x = 1,558.57 × 908.09
  4. Step 4: Simplify right side
    1,128.32x = 1,415,314.04
  5. Step 5: Solve for x
    x = 1,415,314.04/1,128.32
  6. Step 6: Final answer
    x = 1,254.36

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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.