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Finding the Fourth Proportional to 1,308.16, 1,961 and 486.22

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Solution

The fourth proportional to 1,308.16, 1,961 and 486.22 is: 728.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.16 : 1,961 = 486.22 : x
  2. Step 2: Convert to fraction form
    1,308.16/1,961 = 486.22/x
  3. Step 3: Cross multiply
    1,308.16x = 1,961 × 486.22
  4. Step 4: Simplify right side
    1,308.16x = 953,477.42
  5. Step 5: Solve for x
    x = 953,477.42/1,308.16
  6. Step 6: Final answer
    x = 728.87

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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.