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Finding the Fourth Proportional to 992.20, 1,488.30 and 920.20

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Solution

The fourth proportional to 992.20, 1,488.30 and 920.20 is: 1,380.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.20 : 1,488.30 = 920.20 : x
  2. Step 2: Convert to fraction form
    992.20/1,488.30 = 920.20/x
  3. Step 3: Cross multiply
    992.20x = 1,488.30 × 920.20
  4. Step 4: Simplify right side
    992.20x = 1,369,533.66
  5. Step 5: Solve for x
    x = 1,369,533.66/992.20
  6. Step 6: Final answer
    x = 1,380.30

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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.