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Finding the Fourth Proportional to 912.60, 1,369.26 and 638.64

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Solution

The fourth proportional to 912.60, 1,369.26 and 638.64 is: 958.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.60 : 1,369.26 = 638.64 : x
  2. Step 2: Convert to fraction form
    912.60/1,369.26 = 638.64/x
  3. Step 3: Cross multiply
    912.60x = 1,369.26 × 638.64
  4. Step 4: Simplify right side
    912.60x = 874,464.21
  5. Step 5: Solve for x
    x = 874,464.21/912.60
  6. Step 6: Final answer
    x = 958.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.