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Finding the Fourth Proportional to 1,247, 1,720.86 and 695

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Solution

The fourth proportional to 1,247, 1,720.86 and 695 is: 959.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247 : 1,720.86 = 695 : x
  2. Step 2: Convert to fraction form
    1,247/1,720.86 = 695/x
  3. Step 3: Cross multiply
    1,247x = 1,720.86 × 695
  4. Step 4: Simplify right side
    1,247x = 1,195,997.70
  5. Step 5: Solve for x
    x = 1,195,997.70/1,247
  6. Step 6: Final answer
    x = 959.10

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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.