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Finding the Fourth Proportional to 615.12, 920.28 and 371.80

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Solution

The fourth proportional to 615.12, 920.28 and 371.80 is: 556.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.12 : 920.28 = 371.80 : x
  2. Step 2: Convert to fraction form
    615.12/920.28 = 371.80/x
  3. Step 3: Cross multiply
    615.12x = 920.28 × 371.80
  4. Step 4: Simplify right side
    615.12x = 342,160.10
  5. Step 5: Solve for x
    x = 342,160.10/615.12
  6. Step 6: Final answer
    x = 556.25

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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.