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Finding the Fourth Proportional to 919.05, 1,268.40 and 515.32

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Solution

The fourth proportional to 919.05, 1,268.40 and 515.32 is: 711.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.05 : 1,268.40 = 515.32 : x
  2. Step 2: Convert to fraction form
    919.05/1,268.40 = 515.32/x
  3. Step 3: Cross multiply
    919.05x = 1,268.40 × 515.32
  4. Step 4: Simplify right side
    919.05x = 653,631.89
  5. Step 5: Solve for x
    x = 653,631.89/919.05
  6. Step 6: Final answer
    x = 711.20

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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.