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Finding the Fourth Proportional to 638.58, 957.47 and 485.50

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Solution

The fourth proportional to 638.58, 957.47 and 485.50 is: 727.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.58 : 957.47 = 485.50 : x
  2. Step 2: Convert to fraction form
    638.58/957.47 = 485.50/x
  3. Step 3: Cross multiply
    638.58x = 957.47 × 485.50
  4. Step 4: Simplify right side
    638.58x = 464,851.69
  5. Step 5: Solve for x
    x = 464,851.69/638.58
  6. Step 6: Final answer
    x = 727.95

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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.