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Finding the Fourth Proportional to 1,419.93, 2,128.74 and 639.53

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Solution

The fourth proportional to 1,419.93, 2,128.74 and 639.53 is: 958.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.93 : 2,128.74 = 639.53 : x
  2. Step 2: Convert to fraction form
    1,419.93/2,128.74 = 639.53/x
  3. Step 3: Cross multiply
    1,419.93x = 2,128.74 × 639.53
  4. Step 4: Simplify right side
    1,419.93x = 1,361,393.09
  5. Step 5: Solve for x
    x = 1,361,393.09/1,419.93
  6. Step 6: Final answer
    x = 958.77

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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.