Home / 1,247.04-1,720.95-687.53

Finding the Fourth Proportional to 1,247.04, 1,720.95 and 687.53

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Solution

The fourth proportional to 1,247.04, 1,720.95 and 687.53 is: 948.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.04 : 1,720.95 = 687.53 : x
  2. Step 2: Convert to fraction form
    1,247.04/1,720.95 = 687.53/x
  3. Step 3: Cross multiply
    1,247.04x = 1,720.95 × 687.53
  4. Step 4: Simplify right side
    1,247.04x = 1,183,200.18
  5. Step 5: Solve for x
    x = 1,183,200.18/1,247.04
  6. Step 6: Final answer
    x = 948.81

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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.