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Finding the Fourth Proportional to 888.58, 1,226.35 and 640.72

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Solution

The fourth proportional to 888.58, 1,226.35 and 640.72 is: 884.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.58 : 1,226.35 = 640.72 : x
  2. Step 2: Convert to fraction form
    888.58/1,226.35 = 640.72/x
  3. Step 3: Cross multiply
    888.58x = 1,226.35 × 640.72
  4. Step 4: Simplify right side
    888.58x = 785,740.84
  5. Step 5: Solve for x
    x = 785,740.84/888.58
  6. Step 6: Final answer
    x = 884.27

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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.