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Finding the Fourth Proportional to 920.08, 1,268.13 and 664.77

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Solution

The fourth proportional to 920.08, 1,268.13 and 664.77 is: 916.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.08 : 1,268.13 = 664.77 : x
  2. Step 2: Convert to fraction form
    920.08/1,268.13 = 664.77/x
  3. Step 3: Cross multiply
    920.08x = 1,268.13 × 664.77
  4. Step 4: Simplify right side
    920.08x = 843,020.16
  5. Step 5: Solve for x
    x = 843,020.16/920.08
  6. Step 6: Final answer
    x = 916.25

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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.