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Finding the Fourth Proportional to 1,428.58, 2,142.90 and 504.12

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Solution

The fourth proportional to 1,428.58, 2,142.90 and 504.12 is: 756.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.58 : 2,142.90 = 504.12 : x
  2. Step 2: Convert to fraction form
    1,428.58/2,142.90 = 504.12/x
  3. Step 3: Cross multiply
    1,428.58x = 2,142.90 × 504.12
  4. Step 4: Simplify right side
    1,428.58x = 1,080,276.23
  5. Step 5: Solve for x
    x = 1,080,276.23/1,428.58
  6. Step 6: Final answer
    x = 756.19

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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.