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Finding the Fourth Proportional to 1,620.25, 2,428.64 and 925.42

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Solution

The fourth proportional to 1,620.25, 2,428.64 and 925.42 is: 1,387.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.25 : 2,428.64 = 925.42 : x
  2. Step 2: Convert to fraction form
    1,620.25/2,428.64 = 925.42/x
  3. Step 3: Cross multiply
    1,620.25x = 2,428.64 × 925.42
  4. Step 4: Simplify right side
    1,620.25x = 2,247,507.40
  5. Step 5: Solve for x
    x = 2,247,507.40/1,620.25
  6. Step 6: Final answer
    x = 1,387.14

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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.