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Finding the Fourth Proportional to 920.14, 1,380 and 555.03

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Solution

The fourth proportional to 920.14, 1,380 and 555.03 is: 832.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.14 : 1,380 = 555.03 : x
  2. Step 2: Convert to fraction form
    920.14/1,380 = 555.03/x
  3. Step 3: Cross multiply
    920.14x = 1,380 × 555.03
  4. Step 4: Simplify right side
    920.14x = 765,941.40
  5. Step 5: Solve for x
    x = 765,941.40/920.14
  6. Step 6: Final answer
    x = 832.42

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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.