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Finding the Fourth Proportional to 615.36, 921.96 and 485.76

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Solution

The fourth proportional to 615.36, 921.96 and 485.76 is: 727.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.36 : 921.96 = 485.76 : x
  2. Step 2: Convert to fraction form
    615.36/921.96 = 485.76/x
  3. Step 3: Cross multiply
    615.36x = 921.96 × 485.76
  4. Step 4: Simplify right side
    615.36x = 447,851.29
  5. Step 5: Solve for x
    x = 447,851.29/615.36
  6. Step 6: Final answer
    x = 727.79

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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.