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Finding the Fourth Proportional to 695.22, 959.70 and 485.70

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Solution

The fourth proportional to 695.22, 959.70 and 485.70 is: 670.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.22 : 959.70 = 485.70 : x
  2. Step 2: Convert to fraction form
    695.22/959.70 = 485.70/x
  3. Step 3: Cross multiply
    695.22x = 959.70 × 485.70
  4. Step 4: Simplify right side
    695.22x = 466,126.29
  5. Step 5: Solve for x
    x = 466,126.29/695.22
  6. Step 6: Final answer
    x = 670.47

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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.