Home / 1,372.04-2,056.14-639.80

Finding the Fourth Proportional to 1,372.04, 2,056.14 and 639.80

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Solution

The fourth proportional to 1,372.04, 2,056.14 and 639.80 is: 958.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.04 : 2,056.14 = 639.80 : x
  2. Step 2: Convert to fraction form
    1,372.04/2,056.14 = 639.80/x
  3. Step 3: Cross multiply
    1,372.04x = 2,056.14 × 639.80
  4. Step 4: Simplify right side
    1,372.04x = 1,315,518.37
  5. Step 5: Solve for x
    x = 1,315,518.37/1,372.04
  6. Step 6: Final answer
    x = 958.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.