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Finding the Fourth Proportional to 925.40, 1,388.10 and 801.20

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Solution

The fourth proportional to 925.40, 1,388.10 and 801.20 is: 1,201.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.40 : 1,388.10 = 801.20 : x
  2. Step 2: Convert to fraction form
    925.40/1,388.10 = 801.20/x
  3. Step 3: Cross multiply
    925.40x = 1,388.10 × 801.20
  4. Step 4: Simplify right side
    925.40x = 1,112,145.72
  5. Step 5: Solve for x
    x = 1,112,145.72/925.40
  6. Step 6: Final answer
    x = 1,201.80

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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.