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Finding the Fourth Proportional to 615.20, 923.28 and 612.56

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Solution

The fourth proportional to 615.20, 923.28 and 612.56 is: 919.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.20 : 923.28 = 612.56 : x
  2. Step 2: Convert to fraction form
    615.20/923.28 = 612.56/x
  3. Step 3: Cross multiply
    615.20x = 923.28 × 612.56
  4. Step 4: Simplify right side
    615.20x = 565,564.40
  5. Step 5: Solve for x
    x = 565,564.40/615.20
  6. Step 6: Final answer
    x = 919.32

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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.