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Finding the Fourth Proportional to 638.04, 958.40 and 612.64

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Solution

The fourth proportional to 638.04, 958.40 and 612.64 is: 920.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.04 : 958.40 = 612.64 : x
  2. Step 2: Convert to fraction form
    638.04/958.40 = 612.64/x
  3. Step 3: Cross multiply
    638.04x = 958.40 × 612.64
  4. Step 4: Simplify right side
    638.04x = 587,154.18
  5. Step 5: Solve for x
    x = 587,154.18/638.04
  6. Step 6: Final answer
    x = 920.25

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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.