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Finding the Fourth Proportional to 919.32, 1,268.10 and 656.88

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Solution

The fourth proportional to 919.32, 1,268.10 and 656.88 is: 906.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.32 : 1,268.10 = 656.88 : x
  2. Step 2: Convert to fraction form
    919.32/1,268.10 = 656.88/x
  3. Step 3: Cross multiply
    919.32x = 1,268.10 × 656.88
  4. Step 4: Simplify right side
    919.32x = 832,989.53
  5. Step 5: Solve for x
    x = 832,989.53/919.32
  6. Step 6: Final answer
    x = 906.09

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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.