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Finding the Fourth Proportional to 920.21, 1,268.55 and 657.77

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Solution

The fourth proportional to 920.21, 1,268.55 and 657.77 is: 906.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.21 : 1,268.55 = 657.77 : x
  2. Step 2: Convert to fraction form
    920.21/1,268.55 = 657.77/x
  3. Step 3: Cross multiply
    920.21x = 1,268.55 × 657.77
  4. Step 4: Simplify right side
    920.21x = 834,407.79
  5. Step 5: Solve for x
    x = 834,407.79/920.21
  6. Step 6: Final answer
    x = 906.76

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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.