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Finding the Fourth Proportional to 1,381.78, 2,072.99 and 457.30

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Solution

The fourth proportional to 1,381.78, 2,072.99 and 457.30 is: 686.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.78 : 2,072.99 = 457.30 : x
  2. Step 2: Convert to fraction form
    1,381.78/2,072.99 = 457.30/x
  3. Step 3: Cross multiply
    1,381.78x = 2,072.99 × 457.30
  4. Step 4: Simplify right side
    1,381.78x = 947,978.33
  5. Step 5: Solve for x
    x = 947,978.33/1,381.78
  6. Step 6: Final answer
    x = 686.06

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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.