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Finding the Fourth Proportional to 948.36, 1,308.12 and 669

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Solution

The fourth proportional to 948.36, 1,308.12 and 669 is: 922.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.36 : 1,308.12 = 669 : x
  2. Step 2: Convert to fraction form
    948.36/1,308.12 = 669/x
  3. Step 3: Cross multiply
    948.36x = 1,308.12 × 669
  4. Step 4: Simplify right side
    948.36x = 875,132.28
  5. Step 5: Solve for x
    x = 875,132.28/948.36
  6. Step 6: Final answer
    x = 922.78

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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.