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Finding the Fourth Proportional to 1,025.40, 1,542.15 and 920.10

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Solution

The fourth proportional to 1,025.40, 1,542.15 and 920.10 is: 1,383.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.40 : 1,542.15 = 920.10 : x
  2. Step 2: Convert to fraction form
    1,025.40/1,542.15 = 920.10/x
  3. Step 3: Cross multiply
    1,025.40x = 1,542.15 × 920.10
  4. Step 4: Simplify right side
    1,025.40x = 1,418,932.22
  5. Step 5: Solve for x
    x = 1,418,932.22/1,025.40
  6. Step 6: Final answer
    x = 1,383.78

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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.