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Finding the Fourth Proportional to 615.02, 920.88 and 485.28

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Solution

The fourth proportional to 615.02, 920.88 and 485.28 is: 726.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.02 : 920.88 = 485.28 : x
  2. Step 2: Convert to fraction form
    615.02/920.88 = 485.28/x
  3. Step 3: Cross multiply
    615.02x = 920.88 × 485.28
  4. Step 4: Simplify right side
    615.02x = 446,884.65
  5. Step 5: Solve for x
    x = 446,884.65/615.02
  6. Step 6: Final answer
    x = 726.62

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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.