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Finding the Fourth Proportional to 1,672.47, 2,507.78 and 1,328.01

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Solution

The fourth proportional to 1,672.47, 2,507.78 and 1,328.01 is: 1,991.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,672.47 : 2,507.78 = 1,328.01 : x
  2. Step 2: Convert to fraction form
    1,672.47/2,507.78 = 1,328.01/x
  3. Step 3: Cross multiply
    1,672.47x = 2,507.78 × 1,328.01
  4. Step 4: Simplify right side
    1,672.47x = 3,330,356.92
  5. Step 5: Solve for x
    x = 3,330,356.92/1,672.47
  6. Step 6: Final answer
    x = 1,991.29

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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.