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Finding the Fourth Proportional to 1,428.02, 2,142.45 and 940.49

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Solution

The fourth proportional to 1,428.02, 2,142.45 and 940.49 is: 1,411.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.02 : 2,142.45 = 940.49 : x
  2. Step 2: Convert to fraction form
    1,428.02/2,142.45 = 940.49/x
  3. Step 3: Cross multiply
    1,428.02x = 2,142.45 × 940.49
  4. Step 4: Simplify right side
    1,428.02x = 2,014,952.80
  5. Step 5: Solve for x
    x = 2,014,952.80/1,428.02
  6. Step 6: Final answer
    x = 1,411.01

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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.