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Finding the Fourth Proportional to 615.72, 923.98 and 613.28

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Solution

The fourth proportional to 615.72, 923.98 and 613.28 is: 920.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.72 : 923.98 = 613.28 : x
  2. Step 2: Convert to fraction form
    615.72/923.98 = 613.28/x
  3. Step 3: Cross multiply
    615.72x = 923.98 × 613.28
  4. Step 4: Simplify right side
    615.72x = 566,658.45
  5. Step 5: Solve for x
    x = 566,658.45/615.72
  6. Step 6: Final answer
    x = 920.32

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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.