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Finding the Fourth Proportional to 1,620.94, 2,431.18 and 925.35

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Solution

The fourth proportional to 1,620.94, 2,431.18 and 925.35 is: 1,387.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.94 : 2,431.18 = 925.35 : x
  2. Step 2: Convert to fraction form
    1,620.94/2,431.18 = 925.35/x
  3. Step 3: Cross multiply
    1,620.94x = 2,431.18 × 925.35
  4. Step 4: Simplify right side
    1,620.94x = 2,249,698.13
  5. Step 5: Solve for x
    x = 2,249,698.13/1,620.94
  6. Step 6: Final answer
    x = 1,387.90

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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.