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Finding the Fourth Proportional to 638.02, 957.30 and 313.39

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Solution

The fourth proportional to 638.02, 957.30 and 313.39 is: 470.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.02 : 957.30 = 313.39 : x
  2. Step 2: Convert to fraction form
    638.02/957.30 = 313.39/x
  3. Step 3: Cross multiply
    638.02x = 957.30 × 313.39
  4. Step 4: Simplify right side
    638.02x = 300,008.25
  5. Step 5: Solve for x
    x = 300,008.25/638.02
  6. Step 6: Final answer
    x = 470.22

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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.