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Finding the Fourth Proportional to 1,402.64, 2,104 and 428.80

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Solution

The fourth proportional to 1,402.64, 2,104 and 428.80 is: 643.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.64 : 2,104 = 428.80 : x
  2. Step 2: Convert to fraction form
    1,402.64/2,104 = 428.80/x
  3. Step 3: Cross multiply
    1,402.64x = 2,104 × 428.80
  4. Step 4: Simplify right side
    1,402.64x = 902,195.20
  5. Step 5: Solve for x
    x = 902,195.20/1,402.64
  6. Step 6: Final answer
    x = 643.21

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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.