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Finding the Fourth Proportional to 919.30, 1,268.69 and 526.31

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Solution

The fourth proportional to 919.30, 1,268.69 and 526.31 is: 726.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.30 : 1,268.69 = 526.31 : x
  2. Step 2: Convert to fraction form
    919.30/1,268.69 = 526.31/x
  3. Step 3: Cross multiply
    919.30x = 1,268.69 × 526.31
  4. Step 4: Simplify right side
    919.30x = 667,724.77
  5. Step 5: Solve for x
    x = 667,724.77/919.30
  6. Step 6: Final answer
    x = 726.34

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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.