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Finding the Fourth Proportional to 1,419.60, 2,128.86 and 432.22

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Solution

The fourth proportional to 1,419.60, 2,128.86 and 432.22 is: 648.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.60 : 2,128.86 = 432.22 : x
  2. Step 2: Convert to fraction form
    1,419.60/2,128.86 = 432.22/x
  3. Step 3: Cross multiply
    1,419.60x = 2,128.86 × 432.22
  4. Step 4: Simplify right side
    1,419.60x = 920,135.87
  5. Step 5: Solve for x
    x = 920,135.87/1,419.60
  6. Step 6: Final answer
    x = 648.17

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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.