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Finding the Fourth Proportional to 638.63, 881.67 and 483.11

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Solution

The fourth proportional to 638.63, 881.67 and 483.11 is: 666.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.63 : 881.67 = 483.11 : x
  2. Step 2: Convert to fraction form
    638.63/881.67 = 483.11/x
  3. Step 3: Cross multiply
    638.63x = 881.67 × 483.11
  4. Step 4: Simplify right side
    638.63x = 425,939.19
  5. Step 5: Solve for x
    x = 425,939.19/638.63
  6. Step 6: Final answer
    x = 666.96

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Double scale
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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.