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Finding the Fourth Proportional to 919.39, 1,268.75 and 526.40

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Solution

The fourth proportional to 919.39, 1,268.75 and 526.40 is: 726.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.39 : 1,268.75 = 526.40 : x
  2. Step 2: Convert to fraction form
    919.39/1,268.75 = 526.40/x
  3. Step 3: Cross multiply
    919.39x = 1,268.75 × 526.40
  4. Step 4: Simplify right side
    919.39x = 667,870.54
  5. Step 5: Solve for x
    x = 667,870.54/919.39
  6. Step 6: Final answer
    x = 726.43

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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.