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Finding the Fourth Proportional to 920.64, 1,268.64 and 658.24

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Solution

The fourth proportional to 920.64, 1,268.64 and 658.24 is: 907.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.64 : 1,268.64 = 658.24 : x
  2. Step 2: Convert to fraction form
    920.64/1,268.64 = 658.24/x
  3. Step 3: Cross multiply
    920.64x = 1,268.64 × 658.24
  4. Step 4: Simplify right side
    920.64x = 835,069.59
  5. Step 5: Solve for x
    x = 835,069.59/920.64
  6. Step 6: Final answer
    x = 907.05

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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.