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Finding the Fourth Proportional to 1,247.40, 1,721.40 and 716.26

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Solution

The fourth proportional to 1,247.40, 1,721.40 and 716.26 is: 988.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.40 : 1,721.40 = 716.26 : x
  2. Step 2: Convert to fraction form
    1,247.40/1,721.40 = 716.26/x
  3. Step 3: Cross multiply
    1,247.40x = 1,721.40 × 716.26
  4. Step 4: Simplify right side
    1,247.40x = 1,232,969.96
  5. Step 5: Solve for x
    x = 1,232,969.96/1,247.40
  6. Step 6: Final answer
    x = 988.43

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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.