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Finding the Fourth Proportional to 695.47, 959.49 and 485.28

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Solution

The fourth proportional to 695.47, 959.49 and 485.28 is: 669.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.47 : 959.49 = 485.28 : x
  2. Step 2: Convert to fraction form
    695.47/959.49 = 485.28/x
  3. Step 3: Cross multiply
    695.47x = 959.49 × 485.28
  4. Step 4: Simplify right side
    695.47x = 465,621.31
  5. Step 5: Solve for x
    x = 465,621.31/695.47
  6. Step 6: Final answer
    x = 669.51

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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.