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Finding the Fourth Proportional to 920.28, 1,268.51 and 720.77

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Solution

The fourth proportional to 920.28, 1,268.51 and 720.77 is: 993.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.28 : 1,268.51 = 720.77 : x
  2. Step 2: Convert to fraction form
    920.28/1,268.51 = 720.77/x
  3. Step 3: Cross multiply
    920.28x = 1,268.51 × 720.77
  4. Step 4: Simplify right side
    920.28x = 914,300.35
  5. Step 5: Solve for x
    x = 914,300.35/920.28
  6. Step 6: Final answer
    x = 993.51

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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.