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Finding the Fourth Proportional to 1,247.01, 1,720.79 and 687.44

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Solution

The fourth proportional to 1,247.01, 1,720.79 and 687.44 is: 948.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.01 : 1,720.79 = 687.44 : x
  2. Step 2: Convert to fraction form
    1,247.01/1,720.79 = 687.44/x
  3. Step 3: Cross multiply
    1,247.01x = 1,720.79 × 687.44
  4. Step 4: Simplify right side
    1,247.01x = 1,182,943.32
  5. Step 5: Solve for x
    x = 1,182,943.32/1,247.01
  6. Step 6: Final answer
    x = 948.63

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1.5x scale

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.