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Finding the Fourth Proportional to 615, 921.36 and 306.50

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Solution

The fourth proportional to 615, 921.36 and 306.50 is: 459.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    615 : 921.36 = 306.50 : x
  2. Step 2: Convert to fraction form
    615/921.36 = 306.50/x
  3. Step 3: Cross multiply
    615x = 921.36 × 306.50
  4. Step 4: Simplify right side
    615x = 282,396.84
  5. Step 5: Solve for x
    x = 282,396.84/615
  6. Step 6: Final answer
    x = 459.18

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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.